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radar offshore
If someone has unlimited electrical power, is he likely to keep his
Radar on all the time when he is far offshore? Offshore, far from anything else with a functioning radar system, what would prevent someone from detecting a sailboat before a collision. Assume clear weather. |
radar offshore
wrote in message ... : If someone has unlimited electrical power, is he likely to keep his : Radar on all the time when he is far offshore? Offshore, far from : anything else with a functioning radar system, what would prevent : someone from detecting a sailboat before a collision. Assume clear : weather. Stupid question, I'm afraid. This is from the 72 COLREGS INTERNATIONAL- Steering and Sailing Rules RULE 7 Risk of Collision (a) Every vessel shall use all available means appropriate to the prevailing circumstances and conditions to determine if risk of collision exists. If there is any doubt such risk shall be deemed to exist. (b) Proper use shall be made of radar equipment if fitted and operational, including long-range scanning to obtain early warning of risk of collision and radar plotting or equivalent systematic observation of detected objects. In clear language if you have operational radar it must be used when underway. I hope this helps. Wilbur Hubbard |
radar offshore
On Sep 18, 7:39 pm, "Wilbur Hubbard"
wrote: wrote in message ... : If someone has unlimited electrical power, is he likely to keep his : Radar on all the time when he is far offshore? Offshore, far from : anything else with a functioning radar system, what would prevent : someone from detecting a sailboat before a collision. Assume clear : weather. Stupid question, I'm afraid. This is from the 72 COLREGS INTERNATIONAL- Steering and Sailing Rules RULE 7 Risk of Collision (a) Every vessel shall use all available means appropriate to the prevailing circumstances and conditions to determine if risk of collision exists. If there is any doubt such risk shall be deemed to exist. (b) Proper use shall be made of radar equipment if fitted and operational, including long-range scanning to obtain early warning of risk of collision and radar plotting or equivalent systematic observation of detected objects. In clear language if you have operational radar it must be used when underway. I hope this helps. Wilbur Hubbard Wilbur, you are a dumbass. I asked because this did happen. The question is why it happened. Would someone far offshore turn off his radar if he had unlimited power? What would keep a radar from seeing an approaching sailboat. The sailboat had right of way but neither vessel had a lookout. The boat with radar may or may not have had it on. Weather was clear and seas were said to be 4-6'. Related question, if the person(s) on the radar equipped boat had his radar on and it gave an indication of a target on a specific bearing but every time the person looked outside he did not see anything, would he maybe think his radar was malfunctioning and ignore it I see from ads that radars have different modes for "offshore", "nearshore", "harbor". What do these modes do? |
radar offshore
On Thu, 18 Sep 2008 16:27:23 -0700 (PDT),
wrote: If someone has unlimited electrical power, is he likely to keep his Radar on all the time when he is far offshore? Yes Offshore, far from anything else with a functioning radar system, what would prevent someone from detecting a sailboat before a collision. Assume clear weather. High winds - sea clutter - failure to keep a proper radar watch or lookout. |
radar offshore
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radar offshore
On Sep 18, 10:01 pm, wrote:
On Thu, 18 Sep 2008 16:27:23 -0700 (PDT), wrote: If someone has unlimited electrical power, is he likely to keep his Radar on all the time when he is far offshore? Offshore, far from anything else with a functioning radar system, what would prevent someone from detecting a sailboat before a collision. Assume clear weather. Sailboats are notoriously poor reflectors. Even with RADAR reflectors mounted on the mast, they don't always give much of a return. Far offshore and away from known routes, it's usual to put the RADAR on the "Watch" setting, which cycles it between standby and transmit modes. You can set it to wake up and take a look around every 10 minutes, 20 minutes, whatever you want. This is a pretty standard feature on most RADARS that you find on recreational vessels. RADAR doesn't use nearly as much power as you seem to think. I sure don't have unlimited electrical power on my sailboat with a 9.9 hp outboard alternator as my only battery charger. I still use my RADAR a lot. I just don't leave it in transmit mode when I'm not looking at it. Surely the sailboat would give some radar return before the collision (assuming it is on). In clear conditions, what might cause somebody to disregard a radar alarm? How often do radars return false echoes in calm conditions? Just how "invisible" are most sailboats, say 30' to radar without a reflector? Would objects such as downriggers or other things aloft on the boat with radar cause false returns? I see that some radars can be set to look only in a specified arc and ignore things elsewhere. I assume that is to avoid looking behind and concentrate on looking ahead. Why does this matter? Are false returns enough of an issue to cause someone to only look ahead? |
radar offshore
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radar offshore
SNIP
If you are offshore in a small boat *assume that you are *not* being seen, and *be prepared to take effective evasive action regardless of your percieved right-of-way. Agreed!! For that matter assume you're invisible anytime you're out, offshore or for a day sail. Matt |
radar offshore
wrote in message ... Not looking behind you would be a serious error in operation of your boat. You need to stay aware of all 360 degrees. That was brought home to me many years ago. I was (in UK then) leaving the Solent by the easterly channel in darkness. Nice calm night, good visibility, beautiful display of shore lights, so no problem. Then I looked behind and to my horror saw a large dark shape with port and starboard lights both showing with a white masthead light dead centre between them. In other words a large ship was rapidly overtaking me. I got out of the channel sharpish and ever since then have never failed to keep an allround lookout. |
radar offshore
Edgar wrote:
wrote in message ... Not looking behind you would be a serious error in operation of your boat. You need to stay aware of all 360 degrees. That was brought home to me many years ago. I was (in UK then) leaving the Solent by the easterly channel in darkness. Nice calm night, good visibility, beautiful display of shore lights, so no problem. Then I looked behind and to my horror saw a large dark shape with port and starboard lights both showing with a white masthead light dead centre between them. In other words a large ship was rapidly overtaking me. I got out of the channel sharpish and ever since then have never failed to keep an allround lookout. That's why I've been more iterested in radar monitors that radar systems for sailboats. Besides the power drain. -- Richard (remove the X to email) |
radar offshore
wrote in message ... : On Sep 18, 7:39 pm, "Wilbur Hubbard" : wrote: : wrote in message : : ... : : If someone has unlimited electrical power, is he likely to keep his : : Radar on all the time when he is far offshore? Offshore, far from : : anything else with a functioning radar system, what would prevent : : someone from detecting a sailboat before a collision. Assume clear : : weather. : : Stupid question, I'm afraid. This is from the 72 COLREGS : : INTERNATIONAL- : Steering and Sailing Rules : RULE 7 : Risk of Collision : (a) Every vessel shall use all available means appropriate to the prevailing : circumstances and conditions to determine if risk of collision exists. If : there : is any doubt such risk shall be deemed to exist. : (b) Proper use shall be made of radar equipment if fitted and operational, : including long-range scanning to obtain early warning of risk of collision : and : radar plotting or equivalent systematic observation of detected objects. : : In clear language if you have operational radar it must be used when : underway. : : I hope this helps. : : Wilbur Hubbard : : Wilbur, you are a dumbass. I asked because this did happen. The : question is why it happened. Like I explained and you failed to comprehend, it happened because there wasn't a watch posted as required by the rules. A radar watch should have been maintained because operational radar was on board. And a visual watch should have been maintained because it is understood that radar is a "supplemental" watch *in addition to* and not superceding a visual watch. : Would someone far offshore turn off his radar if he had unlimited : power? Yes, because they are ignorant of the Rules and have a total disregard for safety at sea. : What would keep a radar from seeing an approaching sailboat. The : sailboat had right of way but neither vessel had a lookout. You just answered you own question. Neither boat had a lookout. If they aren't maintaining a visual watch as required by the rules what makes you think they care enough to keep a radar watch? snip the rambling on and on with the display of ignorance of the real world of sailing. Wilbur Hubbard |
radar offshore
On Sep 18, 5:33 pm, wrote:
On Sep 18, 7:39 pm, "Wilbur Hubbard" wrote: wrote in message ... : If someone has unlimited electrical power, is he likely to keep his : Radar on all the time when he is far offshore? Offshore, far from : anything else with a functioning radar system, what would prevent : someone from detecting a sailboat before a collision. Assume clear : weather. Stupid question, I'm afraid. This is from the 72 COLREGS INTERNATIONAL- Steering and Sailing Rules RULE 7 Risk of Collision (a) Every vessel shall use all available means appropriate to the prevailing circumstances and conditions to determine if risk of collision exists. If there is any doubt such risk shall be deemed to exist. (b) Proper use shall be made of radar equipment if fitted and operational, including long-range scanning to obtain early warning of risk of collision and radar plotting or equivalent systematic observation of detected objects. In clear language if you have operational radar it must be used when underway. I hope this helps. Wilbur Hubbard Wilbur, you are a dumbass. I asked because this did happen. The question is why it happened. Would someone far offshore turn off his radar if he had unlimited power? What would keep a radar from seeing an approaching sailboat. The sailboat had right of way but neither vessel had a lookout. The boat with radar may or may not have had it on. Weather was clear and seas were said to be 4-6'. Related question, if the person(s) on the radar equipped boat had his radar on and it gave an indication of a target on a specific bearing but every time the person looked outside he did not see anything, would he maybe think his radar was malfunctioning and ignore it I see from ads that radars have different modes for "offshore", "nearshore", "harbor". What do these modes do? IME sail boats are hard to see from some angles due to much of the reflective bits being down in the boat. however i would ask how large the boats where? if a ship is sailing around and has his radar set correctly he ought to be able to see most boats signatures. Sea clutter can be a problem but IMO its not to difficult to tune out most clutter. you watch for the returns that are somewhat constant and use your glasses to confirm. it is not standard practice to shut down radar when out of the common sea lanes in fact on really big ships it is foolish, not only can high end radars read known ships and let you know who it is but some have a tracking system for up to 140 targets which it assigns by signal strength and repetition. I have never missed a sail boat with one of these systems (not saying it cant happen). fact of the matter is that i have seldom missed even floating logs and i can tell you that they work like a dream for pack ice (two other things that tend to get lost in the clutter.) most of the Modes the radar manufacturer's are touting are power settings, long, medium or short range. some actually change the emitter angle to give better returns at these ranges. Sounds to me that both ends of this accident have fault. there should have been watches on both boats. my 2 cents |
radar offshore
"Edgar" wrote in message
... wrote in message ... Not looking behind you would be a serious error in operation of your boat. You need to stay aware of all 360 degrees. That was brought home to me many years ago. I was (in UK then) leaving the Solent by the easterly channel in darkness. Nice calm night, good visibility, beautiful display of shore lights, so no problem. Then I looked behind and to my horror saw a large dark shape with port and starboard lights both showing with a white masthead light dead centre between them. In other words a large ship was rapidly overtaking me. I got out of the channel sharpish and ever since then have never failed to keep an allround lookout. Didn't have quite the thrilling experience... we were offshore, sailing south from SF to Cabo (non-stop delivery), out about 80nm or so. Always kept a watch and during the day saw a large vessel on the horizon behind us and closing. Sure, we're stand-on. In any case, we made preparation to remove the jibe preventer to head up from a broad to beam reach just in case. Didn't like the idea of playing chicken with a 200m tanker. However, after a few minutes it was clear that she was changing course to avoid us, so we held our course. They never answered our hails, but we thanked them anyway. We were on a 48' ketch. -- "j" ganz @@ www.sailnow.com |
radar offshore
Two meter troll wrote:
On Sep 18, 5:33 pm, wrote: On Sep 18, 7:39 pm, "Wilbur Hubbard" wrote: wrote in message ... : If someone has unlimited electrical power, is he likely to keep his : Radar on all the time when he is far offshore? Offshore, far from : anything else with a functioning radar system, what would prevent : someone from detecting a sailboat before a collision. Assume clear : weather. Stupid question, I'm afraid. This is from the 72 COLREGS INTERNATIONAL- Steering and Sailing Rules RULE 7 Risk of Collision (a) Every vessel shall use all available means appropriate to the prevailing circumstances and conditions to determine if risk of collision exists. If there is any doubt such risk shall be deemed to exist. (b) Proper use shall be made of radar equipment if fitted and operational, including long-range scanning to obtain early warning of risk of collision and radar plotting or equivalent systematic observation of detected objects. In clear language if you have operational radar it must be used when underway. I hope this helps. Wilbur Hubbard Wilbur, you are a dumbass. I asked because this did happen. The question is why it happened. Would someone far offshore turn off his radar if he had unlimited power? What would keep a radar from seeing an approaching sailboat. The sailboat had right of way but neither vessel had a lookout. The boat with radar may or may not have had it on. Weather was clear and seas were said to be 4-6'. Related question, if the person(s) on the radar equipped boat had his radar on and it gave an indication of a target on a specific bearing but every time the person looked outside he did not see anything, would he maybe think his radar was malfunctioning and ignore it I see from ads that radars have different modes for "offshore", "nearshore", "harbor". What do these modes do? IME sail boats are hard to see from some angles due to much of the reflective bits being down in the boat. however i would ask how large the boats where? if a ship is sailing around and has his radar set correctly he ought to be able to see most boats signatures. Sea clutter can be a problem but IMO its not to difficult to tune out most clutter. you watch for the returns that are somewhat constant and use your glasses to confirm. it is not standard practice to shut down radar when out of the common sea lanes in fact on really big ships it is foolish, not only can high end radars read known ships and let you know who it is but some have a tracking system for up to 140 targets which it assigns by signal strength and repetition. I have never missed a sail boat with one of these systems (not saying it cant happen). fact of the matter is that i have seldom missed even floating logs and i can tell you that they work like a dream for pack ice (two other things that tend to get lost in the clutter.) most of the Modes the radar manufacturer's are touting are power settings, long, medium or short range. some actually change the emitter angle to give better returns at these ranges. Sounds to me that both ends of this accident have fault. there should have been watches on both boats. my 2 cents Two Meter, I thought that was a really good reply. I would add a couple of things. One is that reading a radar display is a bit of art and not all have either the skill (desire/drive) to acquire. I have seen radars malfunction and it is not always apparent. I got severely embarrassed once by missing an aircraft carrier from a C-130. I had the gain set to not see sea return and the gain drifted off even further without my knowledge. I bought a "blipper" or transponder for off shore runs. I don't have unlimited power but it is "helpful" to a shorthanded sailor to have the blipper alarm on. For those who may not know a transponder will give you an alarm and send a large signal to the ship with the radar. Thanks again. |
radar offshore
On 19 Sep 2008 15:30:02 -0500, Dave wrote:
On Thu, 18 Sep 2008 19:21:19 -0700 (PDT), said: Surely the sailboat would give some radar return before the collision (assuming it is on). Not at all surely. I recall many occasions on the bridge of a Navy ship when sailboats were not picked up on radar. And as you know, Navy vessels have their radar on all the time, and someone monitoring it constantly in CIC. It's particularly likely the sailboat won't be seen if it doesn't have a large inboard. While it may, or may not, apply to western flagged vessels, I have twice called passing merchant vessels and asked if I was showing a good return on their radar. In both cases there was a long enough wait for a response to have allowed them to turn on the radar. I don't *know* that their sets were off but it certainly appeared so to me. Both cases were S.E.A. flagged vessels. The case in New Zealand of the Korean log carrier running down the yacht seems to reinforce that premise. Bruce-in-Bangkok (correct Address is bpaige125atgmaildotcom) |
radar offshore
hpeer wrote:
Two meter troll wrote: On Sep 18, 5:33 pm, wrote: On Sep 18, 7:39 pm, "Wilbur Hubbard" wrote: wrote in message ... : If someone has unlimited electrical power, is he likely to keep his : Radar on all the time when he is far offshore? Offshore, far from : anything else with a functioning radar system, what would prevent : someone from detecting a sailboat before a collision. Assume clear : weather. Stupid question, I'm afraid. This is from the 72 COLREGS INTERNATIONAL- Steering and Sailing Rules RULE 7 Risk of Collision (a) Every vessel shall use all available means appropriate to the prevailing circumstances and conditions to determine if risk of collision exists. If there is any doubt such risk shall be deemed to exist. (b) Proper use shall be made of radar equipment if fitted and operational, including long-range scanning to obtain early warning of risk of collision and radar plotting or equivalent systematic observation of detected objects. In clear language if you have operational radar it must be used when underway. I hope this helps. Wilbur Hubbard Wilbur, you are a dumbass. I asked because this did happen. The question is why it happened. Would someone far offshore turn off his radar if he had unlimited power? What would keep a radar from seeing an approaching sailboat. The sailboat had right of way but neither vessel had a lookout. The boat with radar may or may not have had it on. Weather was clear and seas were said to be 4-6'. Related question, if the person(s) on the radar equipped boat had his radar on and it gave an indication of a target on a specific bearing but every time the person looked outside he did not see anything, would he maybe think his radar was malfunctioning and ignore it I see from ads that radars have different modes for "offshore", "nearshore", "harbor". What do these modes do? IME sail boats are hard to see from some angles due to much of the reflective bits being down in the boat. however i would ask how large the boats where? if a ship is sailing around and has his radar set correctly he ought to be able to see most boats signatures. Sea clutter can be a problem but IMO its not to difficult to tune out most clutter. you watch for the returns that are somewhat constant and use your glasses to confirm. it is not standard practice to shut down radar when out of the common sea lanes in fact on really big ships it is foolish, not only can high end radars read known ships and let you know who it is but some have a tracking system for up to 140 targets which it assigns by signal strength and repetition. I have never missed a sail boat with one of these systems (not saying it cant happen). fact of the matter is that i have seldom missed even floating logs and i can tell you that they work like a dream for pack ice (two other things that tend to get lost in the clutter.) most of the Modes the radar manufacturer's are touting are power settings, long, medium or short range. some actually change the emitter angle to give better returns at these ranges. Sounds to me that both ends of this accident have fault. there should have been watches on both boats. my 2 cents Two Meter, I thought that was a really good reply. I would add a couple of things. One is that reading a radar display is a bit of art and not all have either the skill (desire/drive) to acquire. I have seen radars malfunction and it is not always apparent. I got severely embarrassed once by missing an aircraft carrier from a C-130. I had the gain set to not see sea return and the gain drifted off even further without my knowledge. I bought a "blipper" or transponder for off shore runs. I don't have unlimited power but it is "helpful" to a shorthanded sailor to have the blipper alarm on. For those who may not know a transponder will give you an alarm and send a large signal to the ship with the radar. Thanks again. Knowing nothing about radars and transponders could you tell us what brands are there and how they function. Do they need to be attached to a radar or standalone and do they respond only to Search and Rescue radar signals? Thanks |
radar offshore
In article
, Two meter troll wrote: some actually change the emitter angle to give better returns at these ranges. can you give us a Model Number of a Marine Radar that does the above? -- Bruce in alaska add path after fast to reply |
radar offshore
In article ,
Boeland wrote: Knowing nothing about radars and transponders could you tell us what brands are there and how they function. Do they need to be attached to a radar or standalone and do they respond only to Search and Rescue radar signals? Thanks There is no such thing as a "Search and Rescue Radar" in the Maritime Mobile Radio Service. There are three common Frequency Bands that Marine Radars operate in. S Band 2.4 - 3.1 Ghz X Band 9.3 - 9.5 Ghz Ku Band 14.0 - 14.05 Ghz S Band is used on Large Ships for Long Distances and Weather/Storm Watches. X Band is the most common, and 95% of Marine Radars, as well as 99% of non-commercial Marine Radars use this band. Good out to a Max Range of 100 Miles, or so. Ku Band Never actually seen a Ku Band Marine Radar in 40 years in the Marine Electronics Biz, but there is a Ku Band Allocation. It would have significantly better close-in resolution, but Max Range over water would be the 10's of miles. There is also a Marine Radar Frequency Allocation in the 5.46 - 5.56 Ghz Band, and I have never seen a Marine Radar on this Band, either, however this band is shared with the Aviation Radio Service, and there are Aircraft Radars that do use this Frequency. Radar Transponders in the Maritime Mobile Radio Service are licensed under CFR47Part80, and the technical details for them can be found at 80.375 (d), and (e). They receive Radar emissions from Marine Radars, and then add a predetermined Delay, and then Transmit a very large Return Signal back, which shows up on the interrogating Radar Screen as a VERY BIG TARGET. Radar Transponders are a separate device, and are not part a Marine Radar, fitted on a vessel. They are REQUIRED to be fitted to most classes of SOLAS REQUIRED Vessels. They also are not cheap. Last time I looked, the cheapest one I saw was $1400US, and that was some years back. -- Bruce in alaska add path after fast to reply |
radar offshore
On Sep 20, 10:05 am, Bruce in alaska wrote:
In article , Two meter troll wrote: some actually change the emitter angle to give better returns at these ranges. can you give us a Model Number of a Marine Radar that does the above? -- Bruce in alaska add path after fast to reply nope I only know that they were Sperry's and i had to go up to the dome to make sure the adjustment arms where working when i couldn't find a deck hand. My first and second mates being scared ****less of heading into the rigging (academy boys). when we un moth balled the ship in spring the sounds of my yelling for the mate to change the ranges could be heard in Greenland. I am no radar tech however Sperry kindly gave us several procedure sheets (about the size of the LA phone book) to guide us through. the same systems we had up north where in place on all the ships i was on for that company but i didn't have to mess with most of them. I do recall that we had to import the techs directly from Sperry. i was trying to look up the info you wanted but cant get onto the Sperry web site; it seems it wont load. |
radar offshore
Boeland wrote:
hpeer wrote: Two meter troll wrote: On Sep 18, 5:33 pm, wrote: On Sep 18, 7:39 pm, "Wilbur Hubbard" wrote: wrote in message ... : If someone has unlimited electrical power, is he likely to keep his : Radar on all the time when he is far offshore? Offshore, far from : anything else with a functioning radar system, what would prevent : someone from detecting a sailboat before a collision. Assume clear : weather. Stupid question, I'm afraid. This is from the 72 COLREGS INTERNATIONAL- Steering and Sailing Rules RULE 7 Risk of Collision (a) Every vessel shall use all available means appropriate to the prevailing circumstances and conditions to determine if risk of collision exists. If there is any doubt such risk shall be deemed to exist. (b) Proper use shall be made of radar equipment if fitted and operational, including long-range scanning to obtain early warning of risk of collision and radar plotting or equivalent systematic observation of detected objects. In clear language if you have operational radar it must be used when underway. I hope this helps. Wilbur Hubbard Wilbur, you are a dumbass. I asked because this did happen. The question is why it happened. Would someone far offshore turn off his radar if he had unlimited power? What would keep a radar from seeing an approaching sailboat. The sailboat had right of way but neither vessel had a lookout. The boat with radar may or may not have had it on. Weather was clear and seas were said to be 4-6'. Related question, if the person(s) on the radar equipped boat had his radar on and it gave an indication of a target on a specific bearing but every time the person looked outside he did not see anything, would he maybe think his radar was malfunctioning and ignore it I see from ads that radars have different modes for "offshore", "nearshore", "harbor". What do these modes do? IME sail boats are hard to see from some angles due to much of the reflective bits being down in the boat. however i would ask how large the boats where? if a ship is sailing around and has his radar set correctly he ought to be able to see most boats signatures. Sea clutter can be a problem but IMO its not to difficult to tune out most clutter. you watch for the returns that are somewhat constant and use your glasses to confirm. it is not standard practice to shut down radar when out of the common sea lanes in fact on really big ships it is foolish, not only can high end radars read known ships and let you know who it is but some have a tracking system for up to 140 targets which it assigns by signal strength and repetition. I have never missed a sail boat with one of these systems (not saying it cant happen). fact of the matter is that i have seldom missed even floating logs and i can tell you that they work like a dream for pack ice (two other things that tend to get lost in the clutter.) most of the Modes the radar manufacturer's are touting are power settings, long, medium or short range. some actually change the emitter angle to give better returns at these ranges. Sounds to me that both ends of this accident have fault. there should have been watches on both boats. my 2 cents Two Meter, I thought that was a really good reply. I would add a couple of things. One is that reading a radar display is a bit of art and not all have either the skill (desire/drive) to acquire. I have seen radars malfunction and it is not always apparent. I got severely embarrassed once by missing an aircraft carrier from a C-130. I had the gain set to not see sea return and the gain drifted off even further without my knowledge. I bought a "blipper" or transponder for off shore runs. I don't have unlimited power but it is "helpful" to a shorthanded sailor to have the blipper alarm on. For those who may not know a transponder will give you an alarm and send a large signal to the ship with the radar. Thanks again. Knowing nothing about radars and transponders could you tell us what brands are there and how they function. Do they need to be attached to a radar or standalone and do they respond only to Search and Rescue radar signals? Thanks I have a "see-me" that I bought second hand for a few hundred. http://www.sea-me.co.uk/ Also, here is a link about reflectors, including see-me, that I have not yet digested. http://www.panbo.com/archives/2007/0...ally_work.html |
radar offshore
In article
, Two meter troll wrote: On Sep 20, 10:05 am, Bruce in alaska wrote: In article , Two meter troll wrote: some actually change the emitter angle to give better returns at these ranges. can you give us a Model Number of a Marine Radar that does the above? -- Bruce in alaska add path after fast to reply nope I only know that they were Sperry's and i had to go up to the dome to make sure the adjustment arms where working when i couldn't find a deck hand. My first and second mates being scared ****less of heading into the rigging (academy boys). when we un moth balled the ship in spring the sounds of my yelling for the mate to change the ranges could be heard in Greenland. I am no radar tech however Sperry kindly gave us several procedure sheets (about the size of the LA phone book) to guide us through. the same systems we had up north where in place on all the ships i was on for that company but i didn't have to mess with most of them. I do recall that we had to import the techs directly from Sperry. i was trying to look up the info you wanted but cant get onto the Sperry web site; it seems it wont load. Well No wonder, it was a Sperry Radar.... These pieces of JUNK haven't been around the beach for a decade or so. Kind of like the Kelvin Hughes, Radars, and the Decca's of the early 70's. Fair radars, for being Second Generation, but not really relevant in todays world of 5th Generation Marine Radars. -- Bruce in alaska add path after fast to reply |
radar offshore
On Sat, 20 Sep 2008 17:35:41 GMT, Bruce in alaska
wrote: Radar Transponders are a separate device, and are not part a Marine Radar, fitted on a vessel. They are REQUIRED to be fitted to most classes of SOLAS REQUIRED Vessels. They also are not cheap. Last time I looked, the cheapest one I saw was $1400US, and that was some years back. Decades ago I watched general aviation adopt transponders. The price went down and down. Not unlike computer equipment. So 1400 may be high. I am thinking of adding radar to my 22 foot runabout. There is one with a 18 inch antenna for about $800. I could add a hardtop, [or is that hard dodger?], and mount all kinds of stuff on it. Lights, horn, antennae of all kinds. Probably cost more than I payed for the boat. Casady |
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