I know nothing about using a laptop
but would like to learn. I have downloaded OpenCPN
but know nothing about it other than that I need to buy a GPS
receiver and plug
it in via an NMEA
I've tried plugging in my Garmin
Nuvi 500 GPS
which has all the Garmin charts
on it but Garmin tell me that as soon as you plug
the Nuvi in to a computer, it disables the GPS function???
Any assistance or suggestions would be greatly appreciated.