Garmin Fishfinder 250 Owner's Manual

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22accurate) or a stopwatch to determine your speed over a certain distance (distance / time = speed). Itis 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 willbe shown at the bottom of the calibration window. Note your top speed, then stop the boat and pressENTER.3. By default, the top speed will automatically show in the ‘What was your top water speed?’ fi eld. If aground speed is not available, the top uncalibrated water speed is used instead. If the new speed iscorrect, highlight ‘OK’ and press ENTER. To manually enter a calibration, press ENTER on the speedfi 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 thescreen. Check that the speed sensor wheel is moving or safely increase boat speed. If thereis a problem with the speed sensor/unit or if a speed senor is not installed, a “Water SpeedSensor Is Not Working” message is displayed at the bottom of the display. Check connec-tions of speed sensor cables.Time TabDisplays the current time and date, allows you to adjust the 12 or 24 hour time format, select a timezone and adjust for daylight saving to show correct local time. The time will only display if you are receivingvalid 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 calledGreenwich 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 notreceiving a time from an attached GPS. It is not possible to edit these fields.,Unit OperationMain Menu OptionsMain Menu - Time TabCalibrating the Speed Sensor