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Sorry to dredge this thread back up but this is a project that just keeps dragging on. I have installed a new Garmin Bronze Tri-ducer thru hull transducer (model# 010-10183-01) with a GSD 22 Sounder and Garmin 4008 chartplotter.

All of my cockpit instruments are older Raytheon (pre-Raymarine) ST60 instruments. I had two separate transducers (one for speed and one for depth) for the ST60's but had to choose between eliminating the speed or depth when I installed my new Garmin Tri-ducer. I opted to replace the speed with the triducer, rationalizing that it was better to have depth in the cockpit than speed. However, I miss the speed and log functions at my cockpit fingertips and would like to use the Tri-ducer to supply speed info to my ST60.

Currently, the Tri-ducer plugs directly into the GSD 22 sounder and then is relayed from there into the 4008 chartplotter. Is there any way to get the TriDucer to supply data to the ST60? Could I put a Y in the transducer cable with one lead going to the GSD 22 and one to the ST60? I believe the Tri-ducer sends info on a NMEA 0183 platform--is it possible to convert that to SeaTalk? I found a SeaTalk-NMEA converter but have not seen anything that converts NMEA to SeaTalk.

Neither Raymarine nor Garmin are interested in providing any helpful info--they just want to sell me whole new systems. I would really like to get this taken care of and I am willing to jury rig it if necessary. Any info or help would be greatly appreciated.