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APPENDIX C
Specifications &
Wiring
59
Three optional cables are available to connect the GPS 38 to an external power source or
interface with another unit or PC:
• Cigarette Lighter Adapter (Part No. 010-10084-00) — Allows connection to a 12 volt
DC cigarette lighter plug.
• Data Transfer Cable (Part No. 010-10142-00) — Allows data transfer between
GARMIN GPS units. The GPS 38 is compatible with the following units: GPS
38/40/45/45XL, GPS II/II Plus and GPS12XL units. Information that can be trans-
ferred includes the alamanac, waypoints, routes, and tracklog. Some units (ex: GPS II
Plus) contain waypoint symbols. The GPS 38 does not. Waypoint symbols can only be
transferred from and to units supporting waypoint symbols.
• PC Interface Cable (Part No. 010 10141-00) -— PC interface cable with 9-pin ‘D’ seri-
al data connector.
The following interface formats are supported by the GPS 38 for driving three NMEA
devices:
(UNIT VIEW)
NMEA 0180 NMEA 0182
NMEA 0183 version 1.5
Approved sentences:
GPBWC, GPGLL, GPRMB,
GPRMC,GPXTE, GPVTG,
GPWPL, GPBOD
Proprietary sentences:
PGRMM (map datum),
PGRMZ (altitude), PSLIB
(beacon rec. control)
NMEA 0183 version 2.0
Approved sentences:
GPGGA, GPGLL, GPGSA,
GPGSV, GPRMB, GPRMC,
GPRTE, GPWPL, GPBOD
Proprietary sentences:
PGRME (estimated error),
PGRMM (map datum),
PGRMZ (altitude), PSLIB
(beacon receiver control)
DGPS corrections are accepted on RTCM-104 v. 2.0
format. The GARMINGBR 21 is the recommended bea-
con receiver for use with the GPS 38. Other receivers
with the correct RTCM format may be used, but may not
correctly display status or allow tuning control from the
GPS 38.
GPS 38 Man Rev B 7/23/98 4:34 PM Page 59