Project Summary: optoisolator circuit + car usb power adapter + ebay serial bluetooth module = nmea bluetooth on the cheap.
There's some interesting pc, android, and ipad/phone applications out there but no cheap nmea adapter to broadcast data wirelessly, so take the thoughts in these threads:
nmea 0183 to RS232
Sending GX2150 AIS NMEA data to chart plotter over Bluetooth
NMEA over Bluetooth
and add a cheap one of these to nmea output (on ebay as well) http://www.emartee.com/product/42000...E2%80%94Master
but will need a low voltage power supply, it's low wattage so maybe a battery pack or usb power adapter like rhythmdoctor did. Connect to a pc to configure as a master device (detect other bluetooth automatically) and set baud rate?
rather than spend $300 - $500 on bluetooth, maybe less than $40 to add bluetooth?
Now it's worth trying out that $10 iphone application!
or using that free pc chartplotter program
So some one draw us a circuit diagram please.