I read in the paper about Kingsley Lake, a sink-hole formed , spring-fed lake, an hour drive away from Jacksonville, Florida. This was clearly an excuse to get out USR-1 and go lake exploring.
Exploring the lake bottom while sitting on the dock is why I built an ROV. Exploring the ocean depths while sitting in a boat is why I built an ROV.
USR-1 is very basic but gets the job done pretty well. Heading hold is pretty jerky but works.