Bought a Garmin 123sv Ultra. Have a Garmin 93sv CHIRP. Bought a garmin connection cable to connect the two devices. Saying they are not compatible. Anybody have a solution? Thanks in advamce.

With the Echomap Chirp, the ethernet connection is for Panoptix only (no networking). All later Echomap generations are compatible with ethernet sharing (Plus, UHD, Ultra, UHD2).

Thanks Todd. Looks like I'll get another 126sv to network the two. Should I replace the old transducer while I'm at it?

Yes on the transducer.  Either get the Ultra with the latest and greatest all-in-one GT56 (if you read 2D sonar from the transom), or purchase the GT36/GT8 combo separately to read your 2D sonar from the inhull mounting of the GT8 (for fiberglass boats), and your scanning sonar from the transom-mounted GT36.   You get a y-cable with this bundle to connect both transducers to the Ultra unit.  See link below to purchase this bundle:

 

https://www.garmin.com/en-US/p/735593