Furuno 1751 Operator's Manual page 26

2. OPERATIONAL OVERVIEW
Measurinq Rangg and Bearing
The bearing measured by the cursor or the EBL can be displayed in relative or true bearings
(heading sensor or gyrocompass connection required). Relative bearings are relative to the
bow of the vessel, and true bearings are relative to the True North. The indication "MAG"
(or "GYRO") and the heading sensor (or gyrocompass) bearing (your ship's bearing) appear
at the top of the screen. The indication method is selected at instilation. Refer to page 6-19.
Note that the bearing to the cursor always varies with trackball operation. The EBL and its
indication, however, are automatically fixed when the
EBL
touchpad is pressed or
10
seconds
elapses without trackball operation.
Tips on measuring bearing
1) Bearing measurements of smaller targets pips are more accurate; the center of larger
target pips is not as easily identified.
2) Bearings of stationary or slower moving targets are more accurate than bearings of faster
moving targets.
3) To minimize bearing errors keep echoes in the outer half of the picture by changing the
range scale; angular difference becomes difficult to resolve as a target approaches the
center of the display.
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