JRC JMA-5312-6 Instruction Manual page 235

[II] Operation of Parallel Index Lines
Parallel index lines rotate in the same direction as you turn the [EBL] dial. ( ① , ② )
The intervals of parallel index lines narrow when you turn the [VRM] dial counterclockwise
( ③ ), and widen when you turn the [VRM] dial clockwise ( ④ ).
EBL1
When the [VRM] dial is pressed, the PI Menu closes and the parallel index lines are fixed.
During the operation of parallel index lines, pressing the [EBL1] or [EBL2] key disables operation
for rotation directions. Pressing the [VRM1] or [VRM2] key disables operation for parallel index
line intervals.
HL
EBL2
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4.1 Use of Navigation Tools
VRM1 VRM2
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