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Which echo sounder is good up to (almost) zero depth?
Hi all, I want to upgrade my echo sounder but I find that all of the
units I am looking at give up at around half a meter - unlike my 20 years old unit that I wanted to replace (I need zero depth performance for inland waterways). Does anybody know of a unit/brand/type that would work for me? I'm not interested in fish, just displaying depth. TIA, S |
Which echo sounder is good up to (almost) zero depth?
"Salomon Fringe" wrote in message . .. Hi all, I want to upgrade my echo sounder but I find that all of the units I am looking at give up at around half a meter - unlike my 20 years old unit that I wanted to replace (I need zero depth performance for inland waterways). Does anybody know of a unit/brand/type that would work for me? I'm not interested in fish, just displaying depth. TIA, S To heck with a depth sounder, you need one of these. http://www.mudbuddy.com/News%20&%20P...nformation.htm |
Which echo sounder is good up to (almost) zero depth?
"Salomon Fringe" wrote in message
. .. Hi all, I want to upgrade my echo sounder but I find that all of the units I am looking at give up at around half a meter - unlike my 20 years old unit that I wanted to replace (I need zero depth performance for inland waterways). Does anybody know of a unit/brand/type that would work for me? I'm not interested in fish, just displaying depth. TIA, S I'm guessing they are all that way. Mine doesn't like it much less than 3 feet. They have to program it to wait a little bit for the return so it ignores the initial ping. Even at the speed of sound in the water that distance is covered pretty fast. |
Which echo sounder is good up to (almost) zero depth?
On Mon, 09 Jun 2008 09:28:39 +0200, Salomon Fringe
wrote: Hi all, I want to upgrade my echo sounder but I find that all of the units I am looking at give up at around half a meter - unlike my 20 years old unit that I wanted to replace (I need zero depth performance for inland waterways). Does anybody know of a unit/brand/type that would work for me? I'm not interested in fish, just displaying depth. With the newer digital units, you can degrade the sensitivity down that the return ping is discriminated against the noise. Even the cheaper units are 800 watt so you are dealing with power problem decreasing the sensitivity would help a lot. You will be hard pressed to find a single frequency transducers for 200 KHz which is what you are looking for - 50 Hz units are for deeper water - more than 30'. So, simply put, you need to find a digital unit where you can select 200 KHz and be able to decrease the sensitivity enough to get zero depth performance. I have a Raymarine DS-500 that is selectable to 200 KHz or you can use the dual function and decrease the sensitivity to find dead bottom. The only other thing I would recommend is a single frequency depth flasher which is different from a full sonar. Those work in a different fashion and most of the new ones are 200 KHz which will give you depth discrimination without having the mess around with menus. Some are programmable, some aren't. I wouldn't recommend anything specific because this is a special circumstance and you have to fit your needs to what is available on the market. Hope that helps a little. Now, with respect to zero depth performance - pardon my ignorance but I'm curious why you would be running around in zero depth waters. Do you have a deep draft sailboat or cruiser of some sort? |
Which echo sounder is good up to (almost) zero depth?
Salomon Fringe wrote in news:484cdba2$0$6032$ba620dc5
@text.nova.planet.nl: (I need zero depth performance for inland waterways). Does anybody know of a unit/brand/type that would work for me? I'm not interested in fish, just displaying depth. You're asking for the impossible. The depth limit is determined by the speed of sound and the pulse WIDTH (time) of the ping. A zero depth would require a zero ping, which doesn't transmit anything. The other problem is once the ping transmitter is shut off on a ping, it takes a tiny amount of time for the receiver to come back on to listen for the return from the ping, some latency is inevitable. So, you want the shortest ping time unit with the fastest response you can get to that ping.....and they're all about the same, mostly useless under 2 ft. of depth, right where everyone needs it. What I always thought we needed was a sort of underwater "curb feeler" like we used to put on the pimpmobiles. A couple of stiff wires that would protrude down into the water 3 ft from the BOW that would make an awful griding noise like the curb feelers did through the hull alerting us the expensive lower unit was about to be torn off by the bottom rocks...while we're feeling our way along through the shallows....we shouldn't be in in the first place. The feelers would be spring loaded and fly back along the hull at speeds above no wake speeds. Just for reference, I find the depth sensed by the simplest of depth meters so close to the bottom is much better than the "fish finders" with their charting displays. But, the charting display gives you some instant idea of whether we're getting shallower or deeper and how fast so you can turn away or back.... |
Which echo sounder is good up to (almost) zero depth?
"Jim" wrote in news:g2j7hd$rer$1
@registered.motzarella.org: http://www.mudbuddy.com/News%20&%20P...nformation.htm .....like a trip back to Vietnam or Cambodia....(c; |
Which echo sounder is good up to (almost) zero depth?
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Which echo sounder is good up to (almost) zero depth?
On Mon, 09 Jun 2008 23:31:21 +0000, Short Wave Sportfishing wrote:
On Mon, 09 Jun 2008 11:04:13 -0400, wrote: In a sailboat, the transducer would be mounted in the hull, above the level of the top of the keel, so you would have 4-10 feet (depending on how deep a keel you have) of water even with the keel scraping bottom. Sounders usually have a "keel offset" setting to compensate and tell you how much depth remains after the keel height is subtracted. I understand that - I'm not clear on the whole zero depth concept. If the water's muddy and you can see the bottom that's the zero depth concept or just use the acronym ZDC. The sounder is the noise the hull makes scrapping in the mud. |
Which echo sounder is good up to (almost) zero depth?
"Short Wave Sportfishing" wrote in message ... On Mon, 09 Jun 2008 11:04:13 -0400, wrote: In a sailboat, the transducer would be mounted in the hull, above the level of the top of the keel, so you would have 4-10 feet (depending on how deep a keel you have) of water even with the keel scraping bottom. Sounders usually have a "keel offset" setting to compensate and tell you how much depth remains after the keel height is subtracted. I understand that - I'm not clear on the whole zero depth concept. The Navigator had a Raytheon system on it that was calibrated for the transducer location versus the actual hull depth. It was accurate to 2.8 feet. Ask me why I know. Eisboch |
Which echo sounder is good up to (almost) zero depth?
On Jun 9, 8:06*pm, "Eisboch" wrote:
"Short Wave Sportfishing" wrote in messagenews:f8fr44dh4d6e09iqlo00m3n5gf8993hnkq@4ax .com... On Mon, 09 Jun 2008 11:04:13 -0400, wrote: In a sailboat, the transducer would be mounted in the hull, above the level of the top of the keel, so you would have 4-10 feet (depending on how deep a keel you have) of water even with the keel scraping bottom. Sounders usually have a "keel offset" setting to compensate and tell you how much depth remains after the keel height is subtracted. I understand that - I'm not clear on the whole zero depth concept. The Navigator had a Raytheon system on it that was calibrated for the transducer location versus the actual hull depth. It was accurate to 2.8 feet. * Ask me why I know. Eisboch The simple guess would be that your boat needed 2.9? Good to see you stop back in.. We have all been working very hard to keep it nice while you were away...;) |
Which echo sounder is good up to (almost) zero depth?
wrote in message ... On Jun 9, 8:06 pm, "Eisboch" wrote: The Navigator had a Raytheon system on it that was calibrated for the transducer location versus the actual hull depth. It was accurate to 2.8 feet. Ask me why I know. Eisboch The simple guess would be that your boat needed 2.9? Good to see you stop back in.. We have all been working very hard to keep it nice while you were away...;) Heh... well, the boat drew 4.5', but with the programmed offset, I was good to 2'9". 2'8" meant I just went aground. Eisboch |
Which echo sounder is good up to (almost) zero depth?
On Mon, 09 Jun 2008 19:50:06 -0400, RLM wrote:
On Mon, 09 Jun 2008 23:31:21 +0000, Short Wave Sportfishing wrote: On Mon, 09 Jun 2008 11:04:13 -0400, wrote: In a sailboat, the transducer would be mounted in the hull, above the level of the top of the keel, so you would have 4-10 feet (depending on how deep a keel you have) of water even with the keel scraping bottom. Sounders usually have a "keel offset" setting to compensate and tell you how much depth remains after the keel height is subtracted. I understand that - I'm not clear on the whole zero depth concept. If the water's muddy and you can see the bottom that's the zero depth concept or just use the acronym ZDC. The sounder is the noise the hull makes scrapping in the mud. That's kind of my point. Zero depth implies no water. If there is no water, why do you need a depth finder? |
Which echo sounder is good up to (almost) zero depth?
On Jun 9, 8:26 pm, "Eisboch" wrote:
wrote in message ... On Jun 9, 8:06 pm, "Eisboch" wrote: The Navigator had a Raytheon system on it that was calibrated for the transducer location versus the actual hull depth. It was accurate to 2.8 feet. Ask me why I know. Eisboch The simple guess would be that your boat needed 2.9? Good to see you stop back in.. We have all been working very hard to keep it nice while you were away...;) Heh... well, the boat drew 4.5', but with the programmed offset, I was good to 2'9". 2'8" meant I just went aground. Eisboch ROTF! |
Which echo sounder is good up to (almost) zero depth?
On Mon, 09 Jun 08, Larry wrote:
What I always thought we needed was a sort of underwater "curb feeler" like we used to put on the pimpmobiles. On a sailboat, that's called a centerboard or swing keel. Rick |
Which echo sounder is good up to (almost) zero depth?
On Mon, 09 Jun 08, gfretwell wrote:
Hard to beat a piece of PVC pipe in shallow water. Drill holes in it calibrated to the top rail or gunwale so you can use it at night. One hole 1 ft under the keel, 2 holes 2' below the keel ... A paddle or an oar works too. And you can mark 'em if you'd like. Or use the dipstick method: Dip, bring back aboard, stand it on deck and see how high the wet part is, air dry, repeat ;-) Rick |
Which echo sounder is good up to (almost) zero depth?
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Which echo sounder is good up to (almost) zero depth?
On Mon, 09 Jun 2008 14:55:54 GMT, Short Wave Sportfishing
wrote: Now, with respect to zero depth performance - pardon my ignorance but I'm curious why you would be running around in zero depth waters. Do you have a deep draft sailboat or cruiser of some sort? Measuring zero depth is relatively easy in a deep draft boat becuase the transducer typically has more ping delay to work with, assuming it is not mounted on the bottom of the keel. I find it much more difficult in something like a dinghy that only draws maybe 10 inches. I have trouble getting reliable measurements under 3 ft or so. |
Which echo sounder is good up to (almost) zero depth?
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Which echo sounder is good up to (almost) zero depth?
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Which echo sounder is good up to (almost) zero depth?
On Mon, 09 Jun 08, gfretwell wrote:
Hard to beat a piece of PVC pipe in shallow water. Drill holes in it calibrated to the top rail or gunwale so you can use it at night. One hole 1 ft under the keel, 2 holes 2' below the keel ... Phantman wrote: A paddle or an oar works too. And you can mark 'em if you'd like. Or use the dipstick method: Dip, bring back aboard, stand it on deck and see how high the wet part is, air dry, repeat ;-) HK wrote: You boys don't have a lead weight on a length of marked rope so your crew can call out soundings? Actually, yes I've had one for as long as I can remember, stowed conveniently where I might (or might not) be able to find it in the bottom of some locker somewhere.. But the paddle dip method just seems to happen when the situation arises (with a boathook as a close second choice). Rick |
Which echo sounder is good up to (almost) zero depth?
On Mon, 09 Jun 2008 19:24:42 +0000, Larry wrote:
What I always thought we needed was a sort of underwater "curb feeler" like we used to put on the pimpmobiles. A couple of stiff wires that would protrude down into the water 3 ft from the BOW that would make an awful griding noise Such devices exist. They are frequently called propellers. |
Which echo sounder is good up to (almost) zero depth?
Wayne.B wrote in
: On Mon, 09 Jun 2008 19:24:42 +0000, Larry wrote: What I always thought we needed was a sort of underwater "curb feeler" like we used to put on the pimpmobiles. A couple of stiff wires that would protrude down into the water 3 ft from the BOW that would make an awful griding noise Such devices exist. They are frequently called propellers. When they grow up on steroids, we call them "screws", which make contacting the bottom with them MUCH more exciting! |
Which echo sounder is good up to (almost) zero depth?
Hi all, I want to upgrade my echo sounder but I find that all of the units
I am looking at give up at around half a meter - unlike my 20 years old unit that I wanted to replace (I need zero depth performance for inland waterways). Does anybody know of a unit/brand/type that would work for me? I'm not interested in fish, just displaying depth. I have a garmin with the transducer mounted inside my fiberglass hull, and it can read as shallow as the two foot range with no problem, and I've seen it go as shallow as 1.2-1.8. On several occasions I've also seen it measure double the actual depth in shallow water, but that is a rarity. I assume when that happens that it is measuring the second bounce off of the hull. Having the transducer mounted inside the hull may reduce the sensitivity, enhancing the shallow water performance. I mounted it with silicone seal, rather than hard epoxy, and I don't have a problem with water up to 100-ft(deepest I've been) in sal****er. I used the silicone seal, since I wasn't sure how well it would work in that location, and I wanted to make it easy to move. It worked so well, I never re-installed it with the epoxy. To install the transducer inside the hull, take the end from a spray paint cap and cut the remaining collar to the hull angle and glue it down. After it sets, put about 3/8" of silicone into it and push the transducer into it. I can't remember if I positioned the transducer bottom flush with the hull or vertical. |
Which echo sounder is good up to (almost) zero depth?
On Jun 9, 8:29*pm, Short Wave Sportfishing
wrote: On Mon, 09 Jun 2008 19:50:06 -0400, RLM wrote: On Mon, 09 Jun 2008 23:31:21 +0000, Short Wave Sportfishing wrote: On Mon, 09 Jun 2008 11:04:13 -0400, wrote: In a sailboat, the transducer would be mounted in the hull, above the level of the top of the keel, so you would have 4-10 feet (depending on how deep a keel you have) of water even with the keel scraping bottom. Sounders usually have a "keel offset" setting to compensate and tell you how much depth remains after the keel height is subtracted. I understand that - I'm not clear on the whole zero depth concept. If the water's muddy and you can see the bottom that's the zero depth concept or just use the acronym ZDC. The sounder is the noise the hull makes scrapping in the mud. That's kind of my point. *Zero depth implies no water. *If there is no water, why do you need a depth finder?- Hide quoted text - - Show quoted text - And if there's an engine involved, there may well be an overheating problem. |
Which echo sounder is good up to (almost) zero depth?
Thanks all for all the replies, couldn't reply until now because I am
cruising. Hadn't expected such a great response either ;-) Of course, about zero depth, I am not referring to water just a few centimers deep (...) but to water that is close to 0 below the transducer. The thing is that my more than 20y old unit that I had wanted to replace *is* able to measure as little as 15cm below the keel. My trawler-style boat has about a 25cm difference between fore and aft so if I were to mount it at the best (highest) position I would still have a gray zone of 25cm with the transducers I am looking at (50cm min depth), and I don't like that. There are quite a few harbours where I have less than 50cm below the keel, and if so I want to know how much exactly e.g. to predict if I am going to hit the bottom in a falling tide. A Furuno rep actually told me I should look at a simple smart sensor depth-only device (similar to advice given in this thread) so I guess the big improvement I am looking for (depth graph) is not in the cards for me. Can't believe that sounder technology has made no major improvements in this sense for more than 20 years. Something else is that I have two sea chests with transducers, one with the old digital depth meter I am using and the other from a Lowrance X16. That unit has been enjoying its retirement somewhere on the sea bottom for years now but the transducer is still there and apparently works at a funny frequency, 196khz. Is there any way to detune any brand of 200khz sounder to work with this unit? If not I have no other option than to have the transducer replaced. Some people said I am asking for the impossible when I asked for a near-zero-water-below-the-keel sounder, but when you do the math it sure doesn't seem impossible, at 200khz one cycle takes 5 microseconds, the speed of sound in water is approx. 1500m/s so in principle you should be able to measure down to 0,75 cm. About 1/3 of an inch. Perhaps you can't make the pulse that short or something, dunno. S |
Which echo sounder is good up to (almost) zero depth?
On Jun 11, 1:49*pm, Salomon Fringe wrote:
Thanks all for all the replies, couldn't reply until now because I am cruising. Hadn't expected such a great response either ;-) Of course, about zero depth, I am not referring to water just a few centimers deep (...) but to water that is close to 0 below the transducer. The thing is that my *more than 20y old unit that I had wanted to replace *is* able to measure *as little as 15cm below the keel.. My trawler-style boat has about a 25cm difference between fore and aft so if I were to mount it at the best (highest) position I would still have a gray zone of 25cm with the transducers I am looking at (50cm min depth), and I don't like that. There are quite a few harbours where I have less than 50cm below the keel, and if so I want to know how much exactly e.g. to predict if I am going to hit the bottom in a falling tide. A Furuno rep actually told me I should look at a simple smart sensor depth-only device (similar to advice given in this thread) so I guess the big improvement I am looking for (depth graph) is not in the cards for me. Can't believe that sounder technology has made no major improvements in this sense for more than 20 years. Something else is that I have two sea chests with transducers, one with the old digital depth meter I am using and the other from a Lowrance X16. That unit has been enjoying its retirement somewhere on the sea bottom for years now but the transducer is still there and apparently works at a funny frequency, 196khz. Is there any way to detune any brand of 200khz sounder to work with this unit? If not I have no other option than to have the transducer replaced. Some people said I am asking for the impossible when I asked for a near-zero-water-below-the-keel sounder, but when you do the math it sure doesn't seem impossible, at 200khz one cycle takes 5 microseconds, the speed of sound in water is approx. 1500m/s so in principle you should be able to measure down to 0,75 cm. About 1/3 of an inch. Perhaps you can't make the pulse that short or something, dunno. S It's not sending a single 360 degree cycle. It's sending a short pulse of 200 khz and then waiting for the return. The duration defines how shallow it can read, not the frequency. |
Which echo sounder is good up to (almost) zero depth?
"Salomon Fringe" wrote in message ... Thanks all for all the replies, couldn't reply until now because I am cruising. Hadn't expected such a great response either ;-) Of course, about zero depth, I am not referring to water just a few centimers deep (...) but to water that is close to 0 below the transducer. The thing is that my more than 20y old unit that I had wanted to replace *is* able to measure as little as 15cm below the keel. My trawler-style boat has about a 25cm difference between fore and aft so if I were to mount it at the best (highest) position I would still have a gray zone of 25cm with the transducers I am looking at (50cm min depth), and I don't like that. There are quite a few harbours where I have less than 50cm below the keel, and if so I want to know how much exactly e.g. to predict if I am going to hit the bottom in a falling tide. A Furuno rep actually told me I should look at a simple smart sensor depth-only device (similar to advice given in this thread) so I guess the big improvement I am looking for (depth graph) is not in the cards for me. Can't believe that sounder technology has made no major improvements in this sense for more than 20 years. Something else is that I have two sea chests with transducers, one with the old digital depth meter I am using and the other from a Lowrance X16. That unit has been enjoying its retirement somewhere on the sea bottom for years now but the transducer is still there and apparently works at a funny frequency, 196khz. Is there any way to detune any brand of 200khz sounder to work with this unit? If not I have no other option than to have the transducer replaced. Some people said I am asking for the impossible when I asked for a near-zero-water-below-the-keel sounder, but when you do the math it sure doesn't seem impossible, at 200khz one cycle takes 5 microseconds, the speed of sound in water is approx. 1500m/s so in principle you should be able to measure down to 0,75 cm. About 1/3 of an inch. Perhaps you can't make the pulse that short or something, dunno. S To get very close, you would have to have two transducers. Actually one transmitter and one receiver. The ringing in the transmitter is one of the major timing restrictions. You have to wait until the electronic eddy currents dampen out before you can look for a received signal. And the new units have more power and higher frequencies so you get better definition, but the ringing is worse, so you have the 2-3' of not readable water below the transducer. |
Which echo sounder is good up to (almost) zero depth?
On Wed, 11 Jun 2008 19:49:31 +0200, Salomon Fringe
wrote: Thanks all for all the replies, couldn't reply until now because I am cruising. Hadn't expected such a great response either ;-) Of course, about zero depth, I am not referring to water just a few centimers deep (...) but to water that is close to 0 below the transducer. The thing is that my more than 20y old unit that I had wanted to replace *is* able to measure as little as 15cm below the keel. My trawler-style boat has about a 25cm difference between fore and aft so if I were to mount it at the best (highest) position I would still have a gray zone of 25cm with the transducers I am looking at (50cm min depth), and I don't like that. There are quite a few harbours where I have less than 50cm below the keel, and if so I want to know how much exactly e.g. to predict if I am going to hit the bottom in a falling tide. A Furuno rep actually told me I should look at a simple smart sensor depth-only device (similar to advice given in this thread) so I guess the big improvement I am looking for (depth graph) is not in the cards for me. Can't believe that sounder technology has made no major improvements in this sense for more than 20 years. Something else is that I have two sea chests with transducers, one with the old digital depth meter I am using and the other from a Lowrance X16. That unit has been enjoying its retirement somewhere on the sea bottom for years now but the transducer is still there and apparently works at a funny frequency, 196khz. Is there any way to detune any brand of 200khz sounder to work with this unit? If not I have no other option than to have the transducer replaced. Some people said I am asking for the impossible when I asked for a near-zero-water-below-the-keel sounder, but when you do the math it sure doesn't seem impossible, at 200khz one cycle takes 5 microseconds, the speed of sound in water is approx. 1500m/s so in principle you should be able to measure down to 0,75 cm. About 1/3 of an inch. Perhaps you can't make the pulse that short or something, dunno. Holy smokes - an X-16? Dude - you need to move up to the 21st Century. :) What kind of unit did the 196 KHz transducer connect to? |
Which echo sounder is good up to (almost) zero depth?
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Which echo sounder is good up to (almost) zero depth?
|
Which echo sounder is good up to (almost) zero depth?
Gene Kearns wrote:
On Mon, 09 Jun 2008 09:28:39 +0200, Salomon Fringe penned the following well considered thoughts to the readers of rec.boats: Hi all, I want to upgrade my echo sounder but I find that all of the units I am looking at give up at around half a meter - unlike my 20 years old unit that I wanted to replace (I need zero depth performance for inland waterways). Does anybody know of a unit/brand/type that would work for me? I'm not interested in fish, just displaying depth. This one is pretty accurate and good to the depths you suggest. Very low current draw..... http://tinyurl.com/5wn4pr The best info yet, was in your article: "When sailing in shoal waters, soundings can be taken much quicker with a pole or boat hook than with a lead.? I give my wife or daughter the boat hook, when backing into a beach for a Mediterranean mooring. |
Which echo sounder is good up to (almost) zero depth?
Short Wave Sportfishing wrote:
On Wed, 11 Jun 2008 19:49:31 +0200, Salomon Fringe wrote: Thanks all for all the replies, couldn't reply until now because I am cruising. Hadn't expected such a great response either ;-) Of course, about zero depth, I am not referring to water just a few centimers deep (...) but to water that is close to 0 below the transducer. The thing is that my more than 20y old unit that I had wanted to replace *is* able to measure as little as 15cm below the keel. My trawler-style boat has about a 25cm difference between fore and aft so if I were to mount it at the best (highest) position I would still have a gray zone of 25cm with the transducers I am looking at (50cm min depth), and I don't like that. There are quite a few harbours where I have less than 50cm below the keel, and if so I want to know how much exactly e.g. to predict if I am going to hit the bottom in a falling tide. A Furuno rep actually told me I should look at a simple smart sensor depth-only device (similar to advice given in this thread) so I guess the big improvement I am looking for (depth graph) is not in the cards for me. Can't believe that sounder technology has made no major improvements in this sense for more than 20 years. Something else is that I have two sea chests with transducers, one with the old digital depth meter I am using and the other from a Lowrance X16. That unit has been enjoying its retirement somewhere on the sea bottom for years now but the transducer is still there and apparently works at a funny frequency, 196khz. Is there any way to detune any brand of 200khz sounder to work with this unit? If not I have no other option than to have the transducer replaced. Some people said I am asking for the impossible when I asked for a near-zero-water-below-the-keel sounder, but when you do the math it sure doesn't seem impossible, at 200khz one cycle takes 5 microseconds, the speed of sound in water is approx. 1500m/s so in principle you should be able to measure down to 0,75 cm. About 1/3 of an inch. Perhaps you can't make the pulse that short or something, dunno. Holy smokes - an X-16? Dude - you need to move up to the 21st Century. :) What kind of unit did the 196 KHz transducer connect to? The X-16 used that 196khz transducer. It was long gone when I bought the boat.The sounder still there, the one I am using (the 20yrs old unit) uses 200khz. Move to the 21st century, right, problem is that my sounder from the last century seems better for shallow water operation than the new ones... |
Which echo sounder is good up to (almost) zero depth?
On Jun 11, 6:03 pm, "Reginald P. Smithers III" "Reggie is Here
wrote: Gene Kearns wrote: On Mon, 09 Jun 2008 09:28:39 +0200, Salomon Fringe penned the following well considered thoughts to the readers of rec.boats: Hi all, I want to upgrade my echo sounder but I find that all of the units I am looking at give up at around half a meter - unlike my 20 years old unit that I wanted to replace (I need zero depth performance for inland waterways). Does anybody know of a unit/brand/type that would work for me? I'm not interested in fish, just displaying depth. This one is pretty accurate and good to the depths you suggest. Very low current draw..... http://tinyurl.com/5wn4pr The best info yet, was in your article: "When sailing in shoal waters, soundings can be taken much quicker with a pole or boat hook than with a lead.? I give my wife or daughter the boat hook, when backing into a beach for a Mediterranean mooring. We always back in to our favorite swim spots. I just watch the depth sounder and my wife secures the bow anchor line when the stern is in 3~3.5 feet of water at the stern. We went swimming today at our very favorite beach (Ruggles Beach on Lake Erie) after we took a good friend (78 years old man, dock neighbor for many years when we had our 32 footer) out for a river and lake cruise. He sold his boat several years ago and I figured he needed to get his sea legs back. His health is also going downhill and I figured a day on the water would do him good. He enjoyed the day and the company, as my wife and I did. Great day on the water! |
Which echo sounder is good up to (almost) zero depth?
On Jun 11, 8:32 pm, Gene Kearns
wrote: On Wed, 11 Jun 2008 18:03:03 -0400, Reginald P. Smithers III penned the following well considered thoughts to the readers of rec.boats: Gene Kearns wrote: On Mon, 09 Jun 2008 09:28:39 +0200, Salomon Fringe penned the following well considered thoughts to the readers of rec.boats: Hi all, I want to upgrade my echo sounder but I find that all of the units I am looking at give up at around half a meter - unlike my 20 years old unit that I wanted to replace (I need zero depth performance for inland waterways). Does anybody know of a unit/brand/type that would work for me? I'm not interested in fish, just displaying depth. This one is pretty accurate and good to the depths you suggest. Very low current draw..... http://tinyurl.com/5wn4pr The best info yet, was in your article: "When sailing in shoal waters, soundings can be taken much quicker with a pole or boat hook than with a lead.? I give my wife or daughter the boat hook, when backing into a beach for a Mediterranean mooring. I can't beat the Mediterranean thing, but after setting the main anchor at an appropriate distance from the beach, we do back into the shallows and take an anchor ashore to anchor stern-to..... I can't quite wrap my head around the OP's situation, since my local navigable areas that challenge vessel draft are not in any way a safe haven.... quite to the contrary, they are *very* dangerous! -- Grady-White Gulfstream, out of Oak Island, NC. Homepagehttp://pamandgene.idleplay.net/ Rec.boats at Lee Yeaton's Bayguidehttp://www.thebayguide.com/rec.boats We sometimes anchor just off the Cedar Point Amusement Park or Kelley's Island beaches (usually very crowded) and have to contend with idiots anchored without stern anchors. |
Which echo sounder is good up to (almost) zero depth?
On Wed, 11 Jun 2008 20:32:39 -0400, Gene Kearns
wrote: I can't quite wrap my head around the OP's situation, since my local navigable areas that challenge vessel draft are not in any way a safe haven.... quite to the contrary, they are *very* dangerous! I gave up - I don't get it either. |
Which echo sounder is good up to (almost) zero depth?
On Wed, 11 Jun 2008 03:16:09 +0000, Larry wrote:
Wayne.B wrote in : On Mon, 09 Jun 2008 19:24:42 +0000, Larry wrote: What I always thought we needed was a sort of underwater "curb feeler" like we used to put on the pimpmobiles. A couple of stiff wires that would protrude down into the water 3 ft from the BOW that would make an awful griding noise Such devices exist. They are frequently called propellers. When they grow up on steroids, we call them "screws", which make contacting the bottom with them MUCH more exciting! At 30 inch diameter are they props or screws? At $4k each I don't think I could handle much more excitement. |
Which echo sounder is good up to (almost) zero depth?
Wayne.B wrote:
On Wed, 11 Jun 2008 03:16:09 +0000, Larry wrote: Wayne.B wrote in : On Mon, 09 Jun 2008 19:24:42 +0000, Larry wrote: What I always thought we needed was a sort of underwater "curb feeler" like we used to put on the pimpmobiles. A couple of stiff wires that would protrude down into the water 3 ft from the BOW that would make an awful griding noise Such devices exist. They are frequently called propellers. When they grow up on steroids, we call them "screws", which make contacting the bottom with them MUCH more exciting! At 30 inch diameter are they props or screws? At $4k each I don't think I could handle much more excitement. At $4k they are called screws, as in, If you break one, you are screwed. |
Which echo sounder is good up to (almost) zero depth?
Wayne.B wrote in
: At 30 inch diameter are they props or screws? At $4k each I don't think I could handle much more excitement. I'd call them screws..... |
Which echo sounder is good up to (almost) zero depth?
On Jun 12, 11:47*am, Larry wrote:
Wayne.B wrote : At 30 inch diameter are they props or screws? *At $4k each I don't think I could handle much more excitement. I'd call them screws..... The crabbers and fisherman in Alaska call them wheels. |
Which echo sounder is good up to (almost) zero depth?
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