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BASIC OPERATION > USING THE MAIN MENU
30 Fishfinder 250/250C Owner’s Manual
To calibrate the water speed:
1. Use the ARROW keys 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 will be shown at the
bottom of the calibration window. Note your top speed, then
stop the boat and press ENTER.
3. By default, the top speed will automatically show 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.
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 is displayed 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/unit or
if a speed senor is not installed, a “Water Speed Sensor Is Not
Working” message is displayed at the bottom of the screen.
Check the connections of speed sensor cables.
Time Tab
The Time tab displays the current time and date, allows you to
adjust the 12- or 24-hour time format, select a time zone, and
adjust for daylight saving to show correct local time. The time will
only display if you are receiving valid NMEA input from a GPS
unit (pages 8-9) or in Simulator mode. The following settings are
available:
• Time Format—choose from 12- or 24-hour (military) format.
• Time Zone—choose the correct local time zone or enter your
UTC Offset. The UTC (also called Greenwich mean time)
offset is how many hours you are ahead or behind the time
line.
• Daylight Saving Time—choose from Auto, On, or Off to
adjust for daylight saving.
• Current Time and Current Date—display current time
and date. Fields will be blank if not receiving a time from an
attached GPS. It is not possible to edit these fields.
Main Menu—Time tab