Raymarine Remote display Owner's Manual page 19

31 FFD-1 to FFD-6 (Custom data displays)
If you have a Wireless (NMEA) Interface connected to a PC with
Raymarine proprietary NMEA output capability (PTAK) then your six user
defined free format pages will be displayed in these custom data display
pages.
Typically used by racing sailboats to show "Time to Layline" or corrected
True Wind Direction where the Upwash Correction Table is built into the
PC.
32 OFF (Null data item)
This item is used to mark a page of a single line display, or a line of a
four line display as "hidden".
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Setup and Calibration
17