https://deepersonar.com/en
For about $100 for the cheapest version, this tennis ball sized device can be cast / drifted to a location and bottom depth, shape, and other fish finding applications. The sending unit sends a wifi signal to a smart phone (app required) to display the results.
I can think of a lot of location on my local river where I would be happy to know if the holes are 6-feet or 20-some feet deep.
In the past, this curiosity would have tempted me to put on mask and fins and snorkel under low flow conditions. It seems portable technology may keep me out of the water.
Has anyone bought one of these devices and used it? Comments would be grand.
Ants