JRC JHS-183 Instruction Manual page 95

4. SHIP NAME
The SHIP NAME is selected from SHIP NAME and MMSI.
5. GUARD ZONE
The range of GUARD ZONE ALARM can be set. The range is set from 0 to 99.9NM.
If 00.0NM is set, the alarm is cancelled.
（In order to see this operation, refer to 5.2.3.1 GUARD ZONE ALARM）
6. The number of ships displayed in Graphic screen
The number of ships displayed in Graphic screen can be limited.
The number is selected from 8,16,24,32,200 with ▲ key or ▼ key.
This function is set in case it is hard to distinguish others in this screen.
7. CONTRAST
The contrast of display can be adjusted.
The range is selected from 1 to 13 with ▲ key or ▼ key.
8. AUTO RANGE
When a ship (located within 24NM) is selected in the list, Graphic range is set automatically and
is adjusted to its distance.
Select from ON (valid) or OFF (invalid) with ▲ key or ▼ key.
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