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58 GPSMAP 176/176C Owner’s Manual
MAIN MENU > CELESTIAL TAB
Sonar
• Shallow Water/Deep Water—set alarms to sound when you
enter an area of specified depth that is too shallow and/or too
deep. Enter a depth in the distance fields and use the control
fields to turn the alarms on and off. You must be receiving
NMEA depth data for this function to work.
• Water Temp—sets an alarm to indicate whether the water
temperature has exceeded or dropped below a specific
temperature, or fallen outside/inside a specific temperature
range. Select Above or Below and then enter a specific
temperature, or select Inside or Outside and enter a range of
temperatures. You must be receiving NMEA temperature data
for this function to work.
• Drift—sets an alarm to sound when you have exceeded a
specified drift distance. Select On to turn this alarm on and
then enter a distance.
To set an alarm:
1. Use the ROCKER to highlight the field to the right of the alarm
name you wish to activate and press ENTER.
2. Change the mode to On (Dist or Time for the Arrival alarm)
and press ENTER.
3. Highlight the next field to the right and press ENTER, then
enter the desired settings and press ENTER to finish.
Celestial (Celes) Tab
Tide Tab
The Tide tab shows a graphical chart which displays tide station
information in a 24-hour span starting at midnight station time. You
can choose from different dates and over 3,000 tide stations around
the USA coastline, Alaska, Hawaii, Western Canada, and several of
the Caribbean Islands.
Tide Tab
Station
Name
Date
Tide
Chart
Event
Times
The top of the page displays the tide station being referenced and
the date. The chart shows a 24-hour block of local time (LCL) for
your position, with the reported station time (STA) appearing at the
bottom. Daytime (light bar) and nighttime (dark bar) show across
the time range, and the time progressing from left to right (local