Furuno RP180 - Manual (Page 96)

APPENDIX
AP-9
5. Chart Icons
•
Wrong chart card inserted.
•
Chart overshrunk.
•
Chart overenlarged.
•
Data reliability is low.
•
Chart properly displayed; full accuracy.
•
Chart offset applied.
•
Voltage of battery on circuit board
or memory card is low.
•
Track recording/plotting suspended.
H
•
Alarm setting violated.
•
Icon disappears when alarm is disabled.
•
Appears while screen is being redrawn.