Garmin GPSMAP 276C User Manual

Setting up the Sonar
Use the Setup tab in the Main Menu to set up the Sonar page. Press
MENU two times to open the Main Menu. Select Setup from the
vertical row of tabs on the left, then select Sonar Setup from the
row of tabs along the top of the screen.
Sonar Setup Tab of the Main Menu
Fish Symbols—select how the Sonar page displays underwater
targets and background information. If you select Off, the unit
displays all of the available information about the underwater
environment. If you select a fish symbol, the Sonar page displays
only the information related to that symbol.
Water Type
—select the proper water type you are boating in. Since
sound waves travel through Fresh and Salt water at different rates, it
is necessary to select the Water Type to ensure accurate readings on
the unit.
Depth Number—select how efficient the digital depth update rate
is. Fast Sonar Update updates quicker and is recommended for
low-noise water deeper than 50 feet. Auto is best for shallow water
or high-noise areas, has a slower screen update, and is best used if
you travel a wide variety of depths.
If the unit is unable to track the bottom for any reason, the digits in
the depth window flash on and off to alert you that the unit is not
tracking the bottom.
Map Split Sonar Detail
—select how much detail is displayed on
the Map page with the sonar displayed. Full Range shows data
using the Range setting of the Sonar page, regardless of Zoom or
Bottom Lock. Maximum Detail shows any Zoom or Bottom Lock
data from the Sonar page.
Keel Offset—enter the surface reading for the depth of a keel. This
makes it possible to measure depth from the bottom of your keel
instead of from the transducer’s location. Enter a positive number
to offset for a keel. It is also possible to enter a negative number to
compensate for a large vessel that may draw several feet of water.
The Keel Offset is reflected in the depth reading.
Transducer—
select the type of transducer that you are using. If you
are using a speed-capable transducer/sensor, select Temp, Spd.
96 GPSMAP 276C Owner’s Manual
SETTING UP AND USING SONAR > SETTING UP THE SONAR

Garmin GPSMAP 276C Specifications

General

Sport (fitness, running)	No
Marine (chartplotters, sounders)	Yes
Routes quantity	50
Tracks quantity	20
Number of waypoints	3000
Form factor	Fixed
Product color	Gray
I/O ports	NMEA 0183
Antenna type	Detachable
Display resolution	480 x 320 pixels
Headphone outputs	1
Battery life (max)	15 h
Sustainability certificates	RoHS

Weight and Dimensions

Depth	48 mm
Width	145 mm
Height	81 mm
Weight	385 g