Simrad RS40 User Manual page 27

description of the channel currently in use. It can be a maximum of
12 characters long.
Key beep
Select to allow adjustment of key beep volume.
Volume can be set from 00 - 10 (where 00 is off, and 10 is loudest).
Units
Select SPEED to choose whether displayed in KNOTS, MPH, or KPH.
Select COURSE to toggle between displaying in MAGNETIC or TRUE.
A true north heading is corrected for magnetic variation. A magnetic
north heading source must also output magnetic variation data if
the heading is to be displayed as a true north value.
Int speaker
Select to switch the radio's internal speaker ON or OFF.
Ext speaker
Select to switch the radio's external speaker port ON or OFF.
GPS
Manual
Select MANUAL to enter a GPS position (and time) from another
source when radio is not receiving position data from an internal or
networked source.
The manually entered GPS position can be used in DSC calls, but not
in AIS. AIS will be disabled.
If POS Display is turned ON, the latitude and longitude are shown on
the screen with a prefix 'M' indicating manual entry.
¼ Note:
The manual entry is automatically replaced when a real GPS
position is received via the NMEA 0183, NMEA 2000 or Internal GPS,
depending on the GPS SOURCE setting.
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Radio menus | RS40/RS40-B User Guide