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accurate) or a stopwatch to determine your speed over a certain distance (distance / time = speed). It
is recommended that the calibration take place in water having little or no current.
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?’ fi eld. 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
fi eld, enter a new speed and press ENTER.
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 display. Check connec-
tions of speed sensor cables.
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 (see pgs. 5-6) or in simulator mode. The following settings are available:
• Time Format — choose from 12 or 24 hour (military) time format.
• Time Zone — choose your correct time zone to show correct local time or enter a UTC (also called
Greenwich Time) Offset. The UTC 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 fi elds.
,
Unit Operation
Main Menu Options
Main Menu - Time Tab
Calibrating the Speed Sensor
250C Manual.indd 22 1/27/2004, 3:55:15 PM