Originally Posted by earless
... i will try out the solution you propose as soon as i can in the spring...
When you hook up the USB to Serial adapter you are going to have to find out which com port it is using so you can give that info to OpenCPN. If you aren't sure how to do that and are using windows you need to go 'the control panel' and the 'device manage' and look there for serial devices and there you should find which com port it is using.
I've used this....
....USB to serial adapter...
Special Price! NEW Tripp Lite USA-19HS Keyspan High-Speed USB to Serial Adapter on eBay!
... with good results before. You might find cheaper, but some have problems. You will then need a serial cable to plug
into that and will have to probably cut a plug
off the other end and find the wires you need using an ohm meter on the wires and the pins. Intimidating but not that bad. Then wire to the chart plotter. Or buy just a bare DB 25 plug and wire to the couple pins on it you need.
Another one of interest that I haven't used is this one...
Digital Yacht NMEA Adapter f/PC
... the wires coming out of it that you could then attach to wiring
to the chart plotter. I might try one of these at some point. Anyone else use one? This adapter is a little more, but it is smaller as the USB to serial is all in the little USB plug and you wouldn't have to buy another cable and mess with cutting it and finding the right wires and so on. It is very appealing for this application.
The ship's computer I made has serial ports
so I don't have to mess with the USB to serial on for it, but do have the Keyspan one I linked to above and have used it between a laptop
and the Garmin and it is our backup if the ship's computer went down.
If I'm by the internet
when you are ready to hookup and you have a question let me know and I'll see if I can help. Looks like your boat is about 50 miles up the coast from where my sister lives