J/30 Class Association Forums J/30 Forum The Boat, Sails and Equipment Shopping Instruments, GPS Data on ST60 Speed display

The NMEA output is from the displays. If the displays are shot, but the NMEA data outputs are still good, you could remount the displays as "NMEA brains" below decks to keep them dry, and get any display that accepts NMEA data to mount where you have the NAVMAN displays. The NAVMAN hull transducers are made by Airmar. The series used for the NAVMAN do not output NMEA data directly. Go to this link, then type in NAVMAN and search. You can cross reference the transducers to a number that other vendors use.

I had a NAVMAN wind instrument before I had TackTick. The displays lasted 2 years and fogged up. The wind sending unit died. David Bows had the exact same problem on Mallorca. This is a known issue with their 3100 series products.