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#11
posted to rec.boats.electronics
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Portable Gps/Plotter with AIS-Receiver Support
"Larry" wrote in message ... "Pascal" wrote in news:1172160465.780416.309310 @q2g2000cwa.googlegroups.com: I know that there are many models of gps/ploters that are AIS enabled, That all sounds good until you look at what comes out of the AIS at 38,800 baud RS-232 level data....then look at the GPS/Plotters plodding along on RS-422 (NMEA-0183 isn't RS-232C compatible) at 4800 baud..... Wrong baud rate, wrong voltage levels, INCOMPATIBLE AS USUAL.... "AIS Enabled" just means they'll read an AIS statement IF IT COMES IN AT NMEA'S slow baud rate with the rest of the NMEA data. You can't just plug them in, of course. On Lionheart, our current configuration is an SR-161 receiver feeding a Radio Shack RS-232C serial to USB interface cable ($10) plugged into a USB port on the Dell Latitude notebook running the accompanying virtual serial port software so The Cap'n nav software can find the 38,800 baud data stream on what it thinks is a serial port. NMEA system data comes in on another virtual serial port from my wireless router on the NMEA system. The Cap'n regurgitates the AIS data statements at 4800 baud to the NMEA system so it will show up on any instruments capable of reading it. SOME, not all, models of Raymarine and Garmin are capable of reading it from the NMEA stream IF you upgrade their firmware or buy something new. Currently, seeing the ships on the computer display chart is fine...(c; I want to add another Webfoot RS-232C to Ethernet adapter to our Wireless system. When I get that installed, I'm going to feed it the AIS data from the SR-161 receiver. Being on a separate hard-wired Ethernet address on our LAN, I'll be able to connect to its LAN IP address with the second virtual serial port driver that comes with the Webfoot and can eliminate the current Radio Shack hard-wired USB connection AIS is attached to......making both NMEA at 4800 baud and AIS at 38,800 baud available to The Cap'n WIRELESSLY so it will run anywhere on the boat...or even at the yacht club bar if we dock the boat at the club... (c; NMEA out/in 1 4800 baud--Webfoot 1--Netgear wireless router port 1| | AIS SR-161-38.6Kbaud-----Webfoot 2--Netgear wireless router port 2| | RF-wifi radio link--------------| RF-Wifi radio in laptop-|-Virtual serial COM2--The Cap'n NMEA in | |-Virtual serial COM3--The Cap'n AIS in Larry -- http://www.youtube.com/watch?v=fEJmc...elated&search= I'm surprised the Cap'n can pass through (relay) AIS NMEA sentences, but who is going to read them at 4800baud? All equiment that accept AIS do this at 38400. Also, if there is dense AIS traffic, you would soon run into bandwidth problems running at 4800, the very reason why AIS uses 38400. plano |
#12
posted to rec.boats.electronics
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Portable Gps/Plotter with AIS-Receiver Support
"Bjarke M. Christensen" bjarkeNG@grevestrand_punktum_danmark wrote in message ... Does it make sense ?? It's hard enough already to read the disply on portable units. Adding AIS data on top will just make it totally unreadable. You might be able to read at home, in good light and with you glasses on, but in the boat, dark, raining and in a "windy and critical" situation, you wouldn't be able to see anything .... Bjarke Totally agreed, but what is "portable"? I don't think that there should be any "portable" electronics on a boat. In heavy weather they become missiles or are lost overboard. I cringe when I hear people talk about laptops that can be used "anywhere" on the boat. They should be bolted to the chart table, and by bolted I don't mean kept in place by a piece of shockcord. plano "Pascal" wrote in message ups.com... Anybody knows one? I am using a non portable solution: SR161 + Laptop + GpsMap 276C. I would like to have a gps/plotter portable (or handheld), WeatherProof and useable in the cockpit. I have asked Garmin to give the AIS receiver supprt on the GpsMap 276C but after waiting 2 years I have quit. Thanks Pascal |
#13
posted to rec.boats.electronics
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Portable Gps/Plotter with AIS-Receiver Support
Yes I have a 5 inch display as well and it is almost workable with AIS.
However have in mind that portable are typical below 2-3 inch display and a 2,5 inch display is only 1/4th of a 5 inch..... I got an eTrex with map support. It's worthless .... Screen is far to small for anything. Portable gps's should telle you yor position and cource to next wpt. Bjarke "Pascal" wrote in message oups.com... Well Bjarke, I have seen the AIS data on a Garmin GpsMap 3205 and I reputed the 5" size very good. Course that the display of targets on a RayMarine C80 I had seen too, is better. All wil depend on the zoom level you set the unit, and I think that in regions with no very heavy traffic like here, if it will show about 10 targets at the 5 nm range, this will be very visible. Anyway, in a critical situation, I could reduce the chart detail on the plotter (declutter) and the best thing will be to hear the alarm and see the ship name, course, speed etc. I have used Ais in my Notebook with SeaClear and ShipPlotter and it is fine, the problem is the size of the laptop, the current drain, the mess of cables etc. And what I want is to have all this information at the helm, not below at the nav table. Regards Pascal On 22 fev, 16:47, "Bjarke M. Christensen" bjarkeNG@grevestrand_punktum_danmark wrote: Does it make sense ?? It's hard enough already to read the disply on portable units. Adding AIS data on top will just make it totally unreadable. You might be able to read at home, in good light and with you glasses on, but in the boat, dark, raining and in a "windy and critical" situation, you wouldn't be able to see anything .... Bjarke |
#14
posted to rec.boats.electronics
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Portable Gps/Plotter with AIS-Receiver Support
On 22 fev, 20:08, "Bjarke M. Christensen"
bjarkeNG@grevestrand_punktum_danmark wrote: Yes I have a 5 inch display as well and it is almost workable with AIS. However have in mind that portable are typical below 2-3 inch display and a 2,5 inch display is only 1/4th of a 5 inch..... I agree that eTrex with map is useless. By portable I am not talking for anything smaller than a 276C screen (3.8 "), but preferable, something like 5-7 " (Origami/UMPC like, why not?). I do not understand why the resistance to something portable in the boat. I know that there is more than 2 AIS solutions based on Pocket PC (PPC) and I found it very very good, and the only restriction being the lack of weatherproofing in any PPC. And as I told before, I do not think that a map is necessary for use with AIS, a radar like diagram or even the classical street like diagram would be very useful. |
#15
posted to rec.boats.electronics
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Portable Gps/Plotter with AIS-Receiver Support
"plano" wrote in
: I'm surprised the Cap'n can pass through (relay) AIS NMEA sentences, but who is going to read them at 4800baud? All equiment that accept AIS do this at 38400. Also, if there is dense AIS traffic, you would soon run into bandwidth problems running at 4800, the very reason why AIS uses 38400. plano Listen to your VHF radio tuned to the two AIS channels. The traffic is bursts of data with LOTS of dead time. At some point, you're right, it could become saturated. But 4800 baud would handle the data I've heard coming over the two channels very easily in busy Charleston harbor. Larry -- http://www.youtube.com/watch?v=fEJmc...elated&search= |
#16
posted to rec.boats.electronics
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Portable Gps/Plotter with AIS-Receiver Support
ppc solutions are for home experiments. My Compaq Ipaq lasted for 2 month in
the boat. Then it was dead. And I wasn't (very) sorry. It was to difficult to read in dayligt due to the glossy screen... Bjarke "Pascal" wrote in message oups.com... On 22 fev, 20:08, "Bjarke M. Christensen" bjarkeNG@grevestrand_punktum_danmark wrote: Yes I have a 5 inch display as well and it is almost workable with AIS. However have in mind that portable are typical below 2-3 inch display and a 2,5 inch display is only 1/4th of a 5 inch..... I agree that eTrex with map is useless. By portable I am not talking for anything smaller than a 276C screen (3.8 "), but preferable, something like 5-7 " (Origami/UMPC like, why not?). I do not understand why the resistance to something portable in the boat. I know that there is more than 2 AIS solutions based on Pocket PC (PPC) and I found it very very good, and the only restriction being the lack of weatherproofing in any PPC. And as I told before, I do not think that a map is necessary for use with AIS, a radar like diagram or even the classical street like diagram would be very useful. |
#17
posted to rec.boats.electronics
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Portable Gps/Plotter with AIS-Receiver Support
If averaged over 10 minutes or so, maybe 4800 would offer enough bandwidth
in certain locations, but you just cannot risk that say 20 (long) AIS sentences are received more or less simultaneously. There is no way 4800 baud (1/8th!! of 38400) will handle that. Any idea how much traffic one can expect say in the English Channel? It's the worst case scenario that counts, not the average in Charleston harbor. plano "Larry" wrote in message ... "plano" wrote in : I'm surprised the Cap'n can pass through (relay) AIS NMEA sentences, but who is going to read them at 4800baud? All equiment that accept AIS do this at 38400. Also, if there is dense AIS traffic, you would soon run into bandwidth problems running at 4800, the very reason why AIS uses 38400. plano Listen to your VHF radio tuned to the two AIS channels. The traffic is bursts of data with LOTS of dead time. At some point, you're right, it could become saturated. But 4800 baud would handle the data I've heard coming over the two channels very easily in busy Charleston harbor. Larry -- http://www.youtube.com/watch?v=fEJmc...elated&search= |
#18
posted to rec.boats.electronics
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Portable Gps/Plotter with AIS-Receiver Support
"Pascal" wrote in message
ups.com... Ok, but as I have said, I want a "Portable" unit.. I know that there are many models of gps/ploters that are AIS enabled, like those more recent units from Garmin, Navman, Raymarine, etc but none of them are "portable" (that is, battery operated and easily removable to be used in another boat and at home). What about running an AIS application on a Windows Mobile PDA, inside a waterproof box, using Bluetooth to receive data from an AIS receiver? Meindert |
#19
posted to rec.boats.electronics
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Portable Gps/Plotter with AIS-Receiver Support
"Larry" wrote in message
... "Pascal" wrote in news:1172160465.780416.309310 @q2g2000cwa.googlegroups.com: I know that there are many models of gps/ploters that are AIS enabled, That all sounds good until you look at what comes out of the AIS at 38,800 baud RS-232 level data....then look at the GPS/Plotters plodding along on RS-422 (NMEA-0183 isn't RS-232C compatible) at 4800 baud..... You need to get your facts straight! A Raymarine C/E series chartplotter runs at 38400 baud when in AIS mode. Most likely others do that too.... Oh and besides that, there is also something called NMEA0183-HS which IS 38400 at RS422. Meindert |
#20
posted to rec.boats.electronics
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Portable Gps/Plotter with AIS-Receiver Support
What about running an AIS application on a Windows Mobile PDA, inside a waterproof box, using Bluetooth to receive data from an AIS receiver? Meindert I have seen the site of AIS2Ozi software that runs under Ozi/CE in a PPC using a BT adapter, seems very good. By the way, I have put this questions here as a provocation to the builders, so that someone develop the portable AIS that I dream and I would buy it ready to use, at a low price, some time in future ... I would like something the size and format of a Origami/UMPC, a TFT screen of 5-7" with touch screen support, weather proof to be used in the cockpit, and at a cost of a GpsMap 276C, that is, less than 1K, and it will not need to run under Windows/Tablet/XP.... Regards Pascal |
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