Garmin GPS III - Manual (Page 83)

Interface Settings
Format lets you control the input/output format used when connecting your GPS III to
external NMEA devices, a DGPS beacon receiver, a personal computer, etc. Five format
settings are available:
• GARMIN — the proprietary format used to exchange waypoint, route, track log
data with a PC or with another GPS III.
• NMEA — supports the input/output of standard NMEA 0183 version 2.0 data.
• None — provides no interfacing capabilities.
• RTCM/NMEA — allows Differential GPS (DGPS) input using a standard RTCM
format and also provides NMEA 0183 version 2.0 output.
• RTCM In — allows DGPS input using a standard RTCM format, without any
output capabilities.
To select an input/output format:
1. Highlight the ‘Format’ field and press ENTER.
2. Select the desired setting and press ENTER.
3. If the ‘GARMIN’ format is selected, highlight the ‘Transfer Mode’ field and press ENTER. Select
the desired setting and press ENTER. The ‘Transfer Mode’ field allows you to specify what infor-
mation to request or send to a second GPS III. The ‘Host’ setting lets you control all data transfer
functions from the second GPS III or from a PC.
4. If an ‘RTCM’ format is selected, additional fields are provided to control a GARMIN GBR 21 bea-
con receiver directly from your GPS III. You can enter the beacon frequency and bit rate on the
GPS III and the information will be used to tune the beacon receiver. For more information, refer
to the owner’s manual for the GBR 21.
The ‘GARMIN’ option allows
the GPS III to exchange data
with a PC or another GPS III.
Use this setting with the
optional PC Software Kit.
Select the ‘RTCM/NMEA’
option to use the GPS III
along with a GBR 21
Differential Beacon Receiver.
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REFERENCE
Setup Menu: Interface
GPS III A 7/21/98 8:52 AM Page 75