Garmin eTrex Owner's Manual - Page 39

Reference Interface Page The Interface Page allows you to connect and use devices such as computers and differential GPS (DGPS) beacon receivers with the eTrex. Input/Output Settings The 'Interface' Settings Page allows you to use your eTrex with external NMEA devices, DGPS beacon receivers, a personal computer, etc. You can choose from seven different input/output serial data formats, or none at all. Below is a description of each format: • Garmin - the proprietary format used to exchange waypoint, route, and track data with a PC. • Garmin DGPS - allows DGPS input using a Garmin beacon receiver and a standard RTCM SC-104 format and DGPS tuning. • NMEA OUT - supports the output of standard NMEA 0183 version 3.0 data. • TEXT OUT - allows simple ASCII text output of location and velocity information, without any input capabilities. • RTCM IN - allows DGPS input using a standard RTCM SC-104 format without any output capabilities. • RTCM/NMEA- allows DGPS input using a standard RTCM SC-104 format and supports the output of standard NMEA 0183 version 3.0 data. • RTCM/TEXT- allows DGPS input using a standard RTCM SC-104 format and simple ASCII text output of location and velocity information. • NONE - provides no interfacing capabilities. ) NOTE: Use the 'RTCM IN' setting if your beacon receiver is self-tuning. Interface Page The interface options will allow you to use a PC to download waypoints, routes, and track logs. NMEA stands for "National Marine Electronics Association" and RTCM stands for "Radio Technical Commission for Maritime Services". Both are involved in developing technical standards for the marine electronics industry. 37