1. OPERATIONAL OVERVIEW
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1.33 How to Measure Bearing
The Electronic Bearing Lines (EBLs) are used to take bearings of targets.There are
two EBLs, EBL1 and EBL2. Each EBL is a straight dashed line extending out from the
own ship position up to the circumference of the radar picture. The two EBLs can be
distinguished from each other by the different lengths of their dashes; the dashes on
EBL2 are longer.
Each EBL has an EBRL (Electronic Bearing Range Line, indicated as a short line,
crossing the EBL at right angles). When VRM is not displayed and only EBL is dis-
played, the EBRL shows the range from the EBL origin.
When VRMs are displayed with EBLs the VRM overlaps the EBRL. The value for
EBRL and VRM is the same and is displayed in the VRM box at the bottom-right of the
screen.
1.33.1 Methods to measure bearing
There are two methods for measuring bearing, using the EBL key and on-screen
menu box operation.
Using the EBL keys
1. Press the EBL ON key to activate the [EBL1] box. Press the EBL ON key again
to activate the EBL2 box. Press the EBL ON key again to toggle active EBLs. The
active EBL marker is displayed as shown on the previous page.
2. Rotate the EBL knob clockwise or counterclockwise until the active EBL bisects
the target of interest, then read its bearing at the lower-left corner of the screen.
3. Press the EBL OFF key to erase the active EBL.
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EBL1
EBRLs
EBL2
Target echo
045.3 287.1
°R
EBL1 EBL2
°R
Currently active EBL is highlighted.
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