Marine GPS Receiver SA-920 with Sirfstar 4 Chip: High End GPS Receiver for Boat, Ship - Usable with Plotter, Radio, Fishfinder, etc over RS-232 Interface*. . Overview: Output Lat/Lon, Time, Speed, Course & Satellite Data in standard NMEA protocol and at RS232 level which can be linked directly to ma...

Developed by the United States Power Squadrons, the world's largest private, nonprofit boating organization, Marine Amateur Radio is a complete guide to the use of ham radio for two-way and network communications among boats and between boats and shore stations. Briefly, succinctly, and clearly, thi...