Furuno GP-1600F - Manual (Page 15)

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1.8 Plotter Display Icons
Various icons appear on the display to alert you to operating status.
These icons are as follows:
Figure 1-11 Plotter display icons
L/L
H
Chart icons. See page 2-4.
Chart position offset applied.
L/L position offset applied.
Track recording/plotting turned off.
Alarm setting violated.
Low voltage of internal battery
D E
M O
Demonstaration mode