GPSMAP 292/298 Owner’s Manual 79
USING SONAR > SONAR TAB OPTIONS
To calibrate the water speed:
1. Use the ROCKER to highlight Calibrate Water Speed, and
press ENTER.
2. Bring the boat to a cruising speed. Both the top GPS ground
speed and uncalibrated water speed appear at the bottom
of the calibration window. Note your top speed, stop the
boat, and press ENTER.
3. By default, the top speed automatically appears in the What
was your top water speed? field. If a ground speed is not
available, the top uncalibrated water speed is used instead.
If the new speed is correct, highlight OK, and press ENTER.
If you want to manually enter a calibration, press ENTER on
the speed field, enter a new speed, and press ENTER.
NOTE: If the boat is not moving fast enough or the speed
sensor is not registering a speed, a “Boat Is Not Moving Fast
Enough To Calibrate” message appears at the bottom of the
screen. Check that the speed sensor wheel is moving or safely
increase boat speed. If there is a problem with the speed sensor,
or if a speed senor is not installed, a “Water Speed Sensor Is
Not Working” message appears at the bottom of the screen.
Check the connections of the speed sensor cables.
Graph Sub Tab
Fish Symbols—allows you to determine how the graph shows
underwater targets and background information. If fish symbols
are set to Off, the unit shows all available information about the
underwater environment. If a fish symbol is selected, the graph
shows only the information related to that symbol. Actual fish
returns can not always appear as perfect arches (like in Simulator
Mode), due to the speed or other conditions.
OFF
(default)—the Fishfinder does not interpret the sonar
return data.
—suspended targets appear as symbols. No
background information appears.
—the same as above with the target depth shown.
—suspended targets appear as symbols. Background
information appears, making the distinction between fish and
structure easier.
—the same as above with the target depth shown.
