sounder

I installed a Garmin Airmar P79 in-hull transducer. The transducer reads depths >15FT very accurately to the chart but anything 15FT or less, the depth indication starts flashing and does not continue to update until going into deeper water. The transducer was mounted in accordance with all...

I have bought used Hunter 19 1993. Depthsounder/speed transducer installed, but instrument did not came with the boat. Could you please help me identify the manufacture and model for it? I hope somebody can recognize it by pictures. https://photos.app.goo.gl/5Bsi5CoJBOEQ7t4e2 Thanks.