FERRETT2 NMEA filter

Our boats are Ferry Boats, they travel in both directions. So they have an "A" end & a "B" end. They can and do travel in both directions and the Bridge has two sets of everything. The "A" end all the GPS/ Compass inputs are Normal, on the "B" end everything is shifted 180 Deg's. To shift the "B's" GPS inputs we are using a Ferrett2-RS (NMEA Filter). My problem is that they are no longer being made. Any Suggestions, is anyone, out there using another device to accomplish this task?FERRETT2_20231030_100359.jpg
 
Please see the attached. It can shift the heading (HDT) 180.
 

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