VlocPro2 - Sonde Mode missing?

Recently purchased a second hand locator to use for locating sonde on a sewer camera. In mode selection, I see Peak, Null, Broad, and Peak Arrows as options, but no Sonde mode ( which is referenced in user manual). I've got a ticket into support for help, but thought I'd ask here inc ase someone had an answer.

Any suggestions? Thanks!