Originally Posted by seaescape
Thanks for the input ppl. Just on this thing about serial ports to usb I have read and talked to boat shop ppl and that does seem to be a problem getting the gps to work. I have seen on the net a box called a multiplexer. This is suppose to correct the signal from 9 pin serial to usb.
Has anyone got thoughs on this.
Yes, if you are using a laptop that has no serial ports, and you have one or more serial NMEA devices, then you need a multiplexer. The best are the ones from Shipmodule (www.shipmodul.com
). If you just want GPS input then get a USB GPS. I have one that I use on my laptop when travelling (ie away from the boat with all of its electronic skulduggery) and it works fine.
If you are on board and you have multiple NMEA devices, e.g. sum log, depth, GPS, etc, then all of them will output NMEA on serial and a multiplexer is a must.
I have Tacktick wireless navigation gear which has its own NMEA multiplexer and sender but it still outputs on serial port so you need to have either a serial input or a USB to serial converter on your laptop.