Garmin 101 Owner's Manual

51

Set Interface Page

Choose from different input/output serial data formats (‘I/O FORMAT’) for connecting 

external NMEA devices, a DGPS beacon receiver, a personal computer, etc.  Effective use of 
this feature requires a working knowledge of these formats:
GARMIN: The proprietary format used to exchange waypoint, track, and map data with a 
PC.
GARMIN DGPS: Allows DGPS input using a GARMIN beacon receiver and a standard 
RTCM SC-104 and DGPS tuning.
NMEA Out: Supports the output of standard NMEA 0183 version 3.0 data.
Text Out: Allows ASCII text output of location and velocity information without input 
capabilities.
RTCM In: Allows DGPS input using a standard RTCM SC-104 format without 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.

If ‘GARMIN DGPS’ or ‘RTCM/NMEA’ format is selected, additional fields are provided to 

control a GARMIN differential beacon receiver (e.g. GBR 21 & GBR 23) directly from your 
unit.  In the ‘BEACON’ list, select ‘SCAN’ to tune automatically, or select ‘USER’ to manually 
tune the receiver and enter the beacon frequency and bit rate.  Refer to the beacon receiver 
instructions.