Dog House wrote:.... Basically, if I buy a VHF with AIS built-in, is it functional doing both, or is there a big tradeoff? I would suspect that I can't recieve AIS data while I'm using the radio for other things (unless there's a weird antenna setup that goes along with it), but I'd be curious about actual real-world usage (as in, does this really affect anything).
In the case of the 2200 with GPS/AIS it will send the AIS data to your chart plotter or OpenCPN while at the same time allowing you to talk/receive at any transmission strength. Also at the same time it is looking for anyone's DSC distress signal. It is actuality 3 radios operating in one common case. Most newer radios with just DSC also have two separate receivers in them. One that is always on the channel for DSC and the other that is on any channel you select. Older ones would scan the DSC channel while also transmitting or receiving.
The 2200 transmits the AIS info at 38400 baud so you need one input into the chart plotter or a computer running OpenCPN receiving the AIS from the radio separate from your current GPS location. If OpenCPN can be configured to receive AIS and GPS at 38400 baud then you can use a single RS232 serial to USB converter with the computer along with the wiring to get from the radio to the computer and receive GPS and AIS over the one cable (I haven't tried that).
If not and you want to receive GPS location for use with the OpenCPN then you would need a second RS232 serial to USB converter as that is sent from the radio at 4800 baud. It is probably easier to just use a $35 GPS puck that plugs into a USB port on the computer for GPS position.
I use the puck for GPS with the OpenCPN and one cable from my AIS radio (prior Standard Horizon with no internal GPS) to see AIS targets with OpenCPN. I have another cable from the computer to a handheld in the cockpit so that I can send routes/waypoints from OpenCPN to the handheld and the handheld also transmits GPS location to OpenCPN so I have backup in case the puck failed. The computer I built has two RS232 ports on the back of it so I don't need to use the RS232 to USB converters but have a couple on board as back up in case I had to switch to the laptop or a netbook I also have onboard with OpenCPN and charts loaded.
Sumner
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