OK, I found the sonarchart live setting buried in the menu under “Overlay” as “SCL”. Not exactly intuitive, and could be explained better in the manual. I’ll try it again next time I go to the lake, but that still doesn’t explain why Navionics won’t accept sonar logs from the Hook2.

I own a Hook2-5 splitshot, and this info is incorrect. You can only run the TS transducer on the TS model. While the head units maybe the same HW, I don’t know, but the SW is definitely not.