Using The Trackball [Track Ball] - JRC JMA-5104 Instruction Manual

3.5.4 Using the trackball [TRACK BALL]

[TRACK BALL] enables you to easily measure a distance to a target and the bearing at the same
time.
Operate [TRACK BALL] to position the cursor to the target. The distance to the target and the
bearing are displayed at the right bottom of the screen.
If a navigator such as a GPS is connected, the latitude and longitude at the target position can
also be displayed.
In this case, the target is at a position 4 NM from the own ship.
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