Furuno MU-201C Operator's Manual page 16

Contents of other marks and messages
Mark/Message Function
Select the mark and press [▼] to save the ongoing setting or the auto
adjustment value. Then, OSD is off.
Select the mark and press [▼] to cancel the ongoing setting or the auto
adjustment. Then, OSD is off.
When phase adjustment is completed, this mark is shown. (Press [▼]
to erase this mark.)
This message shows no signal is input.
This message shows the input resolution signal is beyond the
specification of the MU-201C.
This message shows the input video signal is beyond the specification
of the MU-201C.
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