Furuno FM-8500 - Manual (Page 32)

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Locking Initial Settings
Do the following to lock initial settings and enable normal operation.
1. Press the right arrow key to select P.
2. Press the ENT key. The following appears.
Protection< OFF >
ON OFF
Figure 35
3. Press the left arrow key to select ON.
4. Press the ENT key.
All initial settings are locked and the equipment is ready for opera-
tion.