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The GPS III is constructed of high-quality materials and should not require
user maintenance. If your unit ever needs repair, please take it to an authorized
GARMIN service center. The GPS III has no user-serviceable parts. Never attempt
any repairs yourself. To protect your GPS III, keep it in its carrying case (optional accessory) when not in use, and
never allow gasoline or other solvents to come into contact with the case. To clean the case and lens, use a soft cloth
and a household window cleaner.
77
APPENDIX B
Specifications
PHYSICAL
Case: Fully-gasketed, high-impact plastic alloy,
waterproof to IPX7 standards
Size: 6.15”H x 2”W x 1.23”D (15.6 x 5.1 x 1.23 cm)
Weight: Approx. 9 ounces (255g) w/ batteries
Temperature Range: 5 to 158ºF (-15º to 70ºC)†
Memory Back Up: Internal Lithium Battery
PERFORMANCE
Receiver: Differential-ready PhaseTrac12™
Acquisition Time: Approx. 15 seconds (warm start)
Approx. 45 seconds (EZinit/cold start)
Approx. 5 minutes (AutoLocate™)
Update Rate: 1/second, continuous
Position Accuracy: 1-5 meters (3-15 ft) with DGPS
corrections*
15 meters (49 ft) RMS**
Velocity Accuracy: 0.1 knot RMS steady state
Dynamics: Performs to specification to 6 g’s
Interfaces: NMEA 183, RTCM (for DGPS corrections) and
RS-232 for PC interface
Antenna: Detachable with standard BNC connector
POWER
Input: Four 1.5-volt AA batteries† or 10-32 VDC external
Power Consumption: 0.75 watts max.
Battery Life: Up to 8 hours ‡
Specifications subject to change without notice.
* With optional GARMIN GBR 21 Beacon Receiver Input.
** Subject to accuracy degradation to 100m 2DRMS under the U.S. DoD-imposed Selective Availability Program.
† The temperature rating for the GPS III may exceed the usable range of some batteries. Alkaline batteries can rupture at high temperatures.
‡ Alkaline batteries lose a significant amount of their capacity as temperature decreases. Use lithium batteries when operating the GPS III in
below freezing conditions. Extensive use of screen backlighting will significantly reduce battery life.
GPS III A 7/21/98 8:52 AM Page 77
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