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Getting Started
Tour/Backlighting
GPSMAP 178/178C Sounder Getting Started Tour
The Garmin GPSMAP 178/178C Sounder is a powerful electronic navigation system that provides
detailed map coverage and convenient control of many advanced features right from the screen display.
This tour is designed to take you through the basic pages and functions of the system using the simulator
mode. Once you’re familiar with the main pages and functions of the unit, refer to the reference section
for instructions on performing specific tasks and functions.
The Getting Started Tour assumes that the receiver has been properly installed and initialized, and
you have not changed any of the default unit settings. If you have changed any settings (position
formats, units of measure, etc.), the descriptions and pictures in the tour may not match your
configuration.
To turn the GPSMAP 178/178C on:
1. Press and hold the POWER key until the power tone sounds, then release the POWER key. The Warn-
ing Page appears while the unit conducts a self-test.
2. Once the self-test is complete, press the
ENTER/MARK key to agree and acknowledge the warning.
The GPS Information Page appears as the receiver begins acquiring satellites. From this or any other
page, you may also adjust the screen backlighting.
The GPSMAP 178/178C’s adjustable screen backlighting is controlled with the POWER key. The
backlight can cycle through minimum, user-defined, and maximum backlight levels by repeatedly press-
ing the POWER key.
To adjust the backlighting and contrast:
1. Press POWER and the Light/Contrast window appears.
2. Press
POWER again and the user-defined level of backlighting activates. You may adjust this level by
pressing UP or DOWN on the ARROW KEYPAD. If you press POWER one more time, the backlight-
ing is at the minimum setting. Press LEFT (brighter) or RIGHT (darker) to adjust the contrast.
3. Press ENTER or QUIT when done.
A full-screen GPS Information pop-up page is displayed
after you press the ENTER key to acknowledge the
Warning Page. The pop-up page goes away after the unit
gets a position fix or you press either ENTER or QUIT.
Use the ARROW KEYPAD to move the backlighting slider
UP for brighter or DOWN for dimmer backlighting. Press
LEF or RIGHT to adjust the display contrast.