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1. RADAR OPERATION
1-34
1.20 Measuring 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 two
EBLs can be distinguished from each other by the different lengths of their
dashes; the dashes on the No. 2 EBL are longer.
Each EBL carries a range marker, or a short line crossing the EBL at right angles.
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. To operate this marker, rotate
the VRM rotary control on the full keyboard, or put the cursor in the applicable
VRM box and roll the scrollwheel.
1.20.1 Measuring bearing
By keyboard
1. Press 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.
3. Press 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.
EBL1
EBL2
EBL boxes
2. The guidance box reads "EBL ON/." Push the left button to turn on the EBL.
The guidance box now reads "EBL SET L=DELETE /."
3. Push the left button again and the cursor jumps to inside the effective display
area. The guidance box now reads "EBL FIX L=DELETE/."
4. Use the trackball (coarse adjustment) or scrollwheel (fine adjustment) to
bisect the target with the EBL.
5. Push the left button to anchor the EBL and fix its readout, or push the right
button to return the EBL to its previous location (bearing).
6. To erase an EBL, select the appropriate EBL readout box then push the left
button until the EBL disappears from the screen.