I just noticed my cable is way messed up.
I have a 798c si HD mounted on the trolling motor.  Pretty sure it's a "XTM 9 HDSI 180 T".  Is this the most bestest transducer for this unit?

Thanks

The standard transducer for the 700 series and lower SI units is the Compact SI XNT 9 SI 180 T

 

The trolling motor puck version is the XTM 9 SI 180 T

 

The XHS 9 HDSI 180 T is an extra purchase and is the standard transducer for the larger SI units.

That one is 6" long. It is also the same transducer as the XTM 9 HDSI 180 T,  just comes with a trolling motor bracket rather than a transom bracket. It is the top of the line SI transducer for core units.

 

The model of the transducer is on a tag on the cable about 12" from the plug.

 

The HDSI transducer will produce sharper images than the standard one for your unit.

This is the XTM 9 HDSI 180 T

 

I prefer a more sturdy mount for it made by Transducer Shield and Saver

 

Many thanks, that's what I thought.  I also use the Transducer Shield and Saver.

I thought you used both sites.