117
Appendix H
Specifi cations/
Unit Care
Cleaning -
The unit’s case is constructed of high quality
material and does not require user maintenance other
than cleaning. Clean the unit housing using a cloth lightly
dampened with a mild detergent solution and then wipe
dry. Avoid chemical cleaners and solvents that may damage
plastic components. Do not apply cleaner to electrical
contacts on the back of the unit.
Storage -
Do not store the unit where exposure to tempera-
ture extremes may occur (see left), as permanent damage
may result. User information, such as waypoints, routes,
etc. is retained in the unit’s memory, without the need for
external power. It is always a good practice to back up
important user data by manually recording it or download-
ing it to a PC (see pg. 86).
Water Immersion
-The GPSMAP 178C is waterproof
to IEC Standard 60529 IPX7. It can withstand immersion
in 1 meter of water for 30 minutes. Prolonged submersion
can cause damage to the unit. After submersion, be certain
to remove the data card and dry the compartments before
reuse.
To resolve problems that cannot be remedied using this
guide, contact Garmin Customer Support in the U.S.A. at
800-800-1020 or Garmin Europe at 44-1794-519944.
UNIT CARE
DGPS (WAAS) Accuracy:
Position: <3 meters (10 feet), 95% typical*
Velocity: 0.05 meters/sec steady state
Dynamics:
6g's
* Subject to accuracy degradation to 100m 2DRMS under the U.S. DOD-imposed Selective Availability
Program.
Power
Source:
10-35 vDC
Usage:
8 watts max. at 13.8 vDC
Fuse:
AGC/3AG - 2.0 Amp
Sonar
Sounder Power: 500 watts (RMS), 4000 watts (peak to peak) with dual frequency transducer
400 watts (RMS), 3200 watts (peak to peak) with single frequency transducer
Frequency:
50/200 kHz dual frequency; 200 kHz single frequency
Depth:
1500 foot max depth (dual frequency)*
900 foot max depth (single frequency)*
* Depth capacity is dependent on water salinity, bottom type and other water conditions.
GPSMAP178CManual.indd 117
3/19/2004, 3:11:15 PM
