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Appendix
minutes
Update Rate: 1/second, continuous
Antenna:
Astro:
quad helix
DC 40:
patch
Accuracy
GPS:
< 33 ft. (10 m) 95%
DGPS: 10–16 ft. (3–5 m) 95%
typical
(WAAS accuracy in North
America)
Velocity: 0.164 ft./sec. (0.05 m/sec)
steady state
Miscellaneous
Compass: Accuracy (when
calibrated); ± 2 degrees,
resolution; 1 degree
Altimeter: Accuracy (when
calibrated): ± 10 ft. (3 m)
Resolution: 1 ft. (0.3 m)
Range: from -2,000 ft. to
4
Interfaces: USB for computer
Built-in
Data Storage Life: Indefinite; no
Built-in
Map Storage:
Power
Source: Astro: Two 1.5 volt AA
Battery Life:
30,000 ft. (from -610 to
9144 m)
interface
memory battery required
microSD card
capacity (a small portion
of the card capacity is
used for formatting)
batteries, vehicle power adapter,
USB data cable
DC 40: Internal rechargeable
lithium-ion battery, vehicle power
adapter, AC charger
Astro: Up to
24 hours (typical use). Alkaline
batteries lose capacity as
temperature decreases. Use
lithium batteries when operating
in below-freezing conditions.
Astro and DC 40 Owner's Manual
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