Measuring The Bearing; Choosing True Or Relative Bearing - Furuno FCR-2107 Series Operator's Manual

2. Radar Operation
2.12

Measuring the Bearing

Use the Electronic Bearing Lines (EBLs) to take bearings of targets. There are two EBLs, No. 1 and No. 2. Each
EBL is a straight dashed line extending out from the own ship position up to the circumference of the radar picture.
The fine dashed line is the No. 1 EBL and the coarse dashed one is the No. 2 EBL.
2.12.1 Measuring the bearing
From the control unit w/keyboard
1. Push the EBL ON key to display either of the EBLs. Successive presses of the EBL ON key toggle the active
EBL between No. 1 and No. 2. The currently active marker is enclosed with >.....<.
2. Operate the EBL rotary control clockwise or counterclockwise until the active EBL bisects the target of interest,
and read its bearing at the lower-left corner of the screen.
Note: Each EBL carries a range marker, or a short line crossing the EBL at right angles and its distance from
the EBL origin is indicated at the VRM readout whether or not the corresponding VRM is displayed. The range
marker changes its position along the EBL with the rotation of the VRM control.
3. Push the EBL OFF key to erase each EBL.
By trackball
1. Use the trackball to place the arrow in the EBL1 or EBL2 box,
whichever EBL you want to use.
EBL boxes
2. Spin the scrollwheel to bisect the target with the EBL.
Note: Each EBL carries a range marker, or a short line crossing the
EBL at right angles and its distance from the EBL origin is indicated at
the VRM readout whether or not the corresponding VRM is displayed.
The range marker changes its position along the EBL with the rotation
of the VRM.
3. To erase an EBL, select the appropriate EBL box then push the left
button until the EBL disappears from the screen.
2.12.2

Choosing true or relative bearing

The EBL readout is affixed by "R" (relative) if it is relative to own ship's heading, "T" (true) if it is referenced to the
north.
To select bearing reference in the head-up mode, do the following:
1. Use the trackball to select the Menu box at the right side of the screen.
2. Push the left button to display the Main menu.
3. Spin the scrollwheel to select Mark then push the scrollwheel.
4. Use the trackball to put the arrow on the setting of the EBL cursor bearing.
5. Spin the scrollwheel to select True or REL then push the scrollwheel.
6. Click the Close window button (X) to close the Mark menu.
Note: When the gyrocompass heading changes, the EBL and its indication change as follows:
Head-up, relative: EBL indication and EBL remain unchanged.
Head-up, true: EBL indication remains the same; EBL moves.
Course-up, true: EBL indication and EBL remain unchanged.
Course-up, relative: EBL indication remains the same, EBL moves.
North-up, relative: EBL indication remains the same, EBL moves.
North-up, true: EBL indication and EBL remain unchanged.
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