Three optional cables are available to connect the GPS 40 to an
external power source or interface with another unit or PC:
• Cigarette Lighter Adapter— Allows connection to a 12 volt DC
cigarette lighter plug and reduces voltage to 5-8 volts DC.
• Data Cross-Load Cable— Allows data transfer between GPS
38/40/45/45 XL units.
• PC Kit Data Cable— PC interface cable with 9-pin ‘D’ serial data
connector.
The following interface formats are supported by the GPS 40 for
driving three NMEA devices:
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
GARMIN GBR 21 is the recommended beacon receiver for use with
the GPS 40. Other receivers with the correct RTCM format may be
used, but may not correctly display status or allow tuning control.
Introduction
Preface
59
Appendix C
Specifications,
Wiring
&Battery
Replacement
(UNIT VIEW)
The GPS 40 comes with 4
AA alkaline batteries. After
approximately 12 hours of
operation in normal mode
or 20 hours of operation in
b a t t e ry-saver mode, the
batteries will need to be
replaced. Rechargeable ni-
cad or lithium batteries
may also be used. Note that
the battery level indicator
is calibrated for alkaline
batteries, and ni-cad or
lithium batteries will only
show battery life at partial
scale.
To replace batteries:
Remove the battery cover
by turning the thumb loop
at the bottom of the unit
1/4 turn counter-clockwise.
Remove used batteries and
i n s e rt new batteries into
position. The battery pole
you can still see should
match the symbol marked
on the case. Replace and
secure the battery cover by
turning the thumb loop 1/4
turn clockwise.
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