Garmin GPSMAP 298C Owner's Manual - Page 83

Sonar Tab Options, General Sub Tab

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Sonar Tab Options USING SONAR > SONAR TAB OPTIONS General Sub Tab Water Type-because 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. Keel Offset-used to offset 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, or enter a negative number to compensate for a large vessel that can draw several feet of water. The Keel Offset reflects in the depth reading. Show Numbers Option To access and change a setting on the Sonar tab: 1. Press and hold ADJ/MENU to access the Main Menu. Use the ROCKER to highlight the Sonar tab. 2. Using the ROCKER, highlight the sub tab and then the field, and press ENTER. 3. Highlight the setting, and press ENTER. 4. Press QUIT to return to the Sonar Page or a previous page. Keel Offset: Transducer at Surface Enter (+) positive number to show depth from bottom of keel Keel Offset: Transducer at Bottom of Keel Enter (-) negative number to show depth from surface GPSMAP 292/298 Owner's Manual 77

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GPSMAP 292/298 Owner’s Manual
77
U
SING
S
ONAR
>
S
ONAR
T
AB
O
PTIONS
Sonar Tab Options
Show Numbers Option
To access and change a setting on the Sonar tab:
1.
Press and hold
ADJ/MENU
to access the Main Menu. Use
the
ROCKER
to highlight the
Sonar
tab.
2.
Using the
ROCKER
, highlight the sub tab and then the field,
and press
ENTER
.
3.
Highlight the setting, and press
ENTER
.
4.
Press
QUIT
to return to the Sonar Page or a previous page.
General Sub Tab
Water Type
—because 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.
Keel Offset
—used to offset 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, or enter a negative number to
compensate for a large vessel that can draw several feet of water.
The Keel Offset reflects in the depth reading.
Keel Offset:
Transducer at
Surface Enter (+)
positive number to
show depth from
bottom of keel
Keel Offset: Transducer
at Bottom of Keel Enter
(-) negative number to
show depth from surface