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Chances are good that the NAVMAN transducers will work since they are probably made by Airmar. Go to this Airmar link and search for NAVMAN. Then look to see what the related Airmar Xducer series is. Pull the data sheet and compare it to TackTick T911 Speed/Temp (Airmar ST650) and TackTick T912 Depth (Airmar DT800 200kHz transducer). NAVMAN and TackTick both use the Airmar standard analog format from the transducers (e.g. paddlewheel pulses for speed, not NMEA 0183 or NMEA 2000).

I replaced old Datamarine hull transducers after I hauled the boat. Same diameter hole, so no redrilling required.