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Three operating modes are available:
• Com On— (Default) Enables all VHF communica-
tion features.
• Com Off— Disables all VHF communication fea-
tures. Use this mode if you only want to use GPS or
if battery life is a concern.
• Weather Alert— Accesses the weather alert audio
page. Muting the weather broadcast audio will cause
the GPSCOM 170 to remain silent until the National
Weather Service activates an alert tone.
To select an operating mode
:
1. Highlight the ‘Com Mode’ field and press
E
.
2. Use the arrow keypad to select an option, and press
E
to confirm your choice.
Selecting the weather alert mode option accesses the
weather alert page where you can choose to mute the
weather broadcast audio. The receiver will unmute and
remain unmuted once a severe weather tone is received
from the NWS.
To mute the weather broadcast audio:
1. Highlight the ‘Com Mode’ field and press
E
.
2. Use the arrow keypad to select ‘Weather Alert?’ and
press
E
. The weather alert mode submenu will
appear with the audio field highlighted.
3. Press
E
to select ‘Mute’.
4. Press
C
to exit the weather alert mode page.
Selecting a com mode on the
com setup page.
Weather Alert Page
30
VHF Operating
Modes
Reference
170 manual pages rev D 9/21/98 9:23 AM Page 30