Garmin GPS 38 User Manual download pdf (Page 55)

Interface Setup

The GPS 38’s interface setup page lets you specify the

interfacing formats for connecting external devices. There

are five interface options: GRMN/GRMN, None/None,

None/NMEA, RTCM/None, and RTCM/NMEA. Each option

lists the input format first, followed by the output format.

To select I/O format:

1. Highlight the I/O field and press

2. Select the desired setting and press

The GRMN/GRMN setting is a proprietary format that

lets you exchange information such as waypoints, routes

and track logs between two GARMIN GPS devices or a PC.

During data transfer, the number of packets being

exchanged will be displayed on screen.

To select a transfer option:

1. Highlight the ‘Host’ field and press

2. Select a setting and press

To disable all interfacing capabilities, select the

None/None setting. If you want to output NMEA data to

compatible external devices without any differential input

capability, select the None/NMEA setting. Once a NMEA

output setting has been selected (with or without RTCM

input), the NMEA field will become highlighted. NMEA

formats 0180, 0182 or 0183 (1.5 or 2.0) are available.

To select a NMEA format:

1. Press

to begin a NMEA selection.

2. Select a format and press

DGPS Interface

The last two format settings allow the differential-ready

GPS 38 to accept RTCM DGPS corrections in RTCM 104

version 2.0 format. Using DGPS corrections will improve

receiver accuracy to 5-10 meters, regardless of errors

induced by the government’s Selective Availability (SA) pro-

gram. The RTCM/NONE format will allow connection to

any manually tuned beacon receiver with the proper output

interface, with the baud rate selectable from the GPS 38.

Interface Setup Page

The default interface setting

is the GARMIN/GARMIN

option, which can be used

for unit-to-unit data trans-

fer or interfacing with a

GARMINPCKit.

NMEAInterface

Once a NMEA format is

selected, the baud rate will

automatically be set to the

proper speed. See Appendix

C for a list of NMEA

sentences.

R E F E R E N C E

Interface Setup

& DGPS Setup

GPS 38 Man Rev B 7/23/98 4:34 PM Page 51

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Garmin GPS 38 User Manual Page 55

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