It depends on who makes them. A little wet, from a bathtub, was never a problem. Scuba gear or deepsea diving was right out.
It depends on what the type of monitor it is...GPS or simple curfew monitoring. He can ask the Officer installing the device as well.
__________________ ~Igor Louis~ "Never violate a woman, nor harm a child. Do not lie, cheat or steal. These things are for lesser men. Protect the weak against the evil strong. And never allow thoughts of gain to lead you into the pursuit of evil."
Your other issue, given it is a release to an EM caseload, is whether the schedule will even have been done in a manner that allows time out of the house to go jet-ski'ing.
Some EM schedules are more stringent than others, while some EM officers just enter the 'may leave/must leave' coding. But also, the day of release is often a day where time isn't going to be available...
As another consideration...I have spoken with several clients within the day or so of their release, and all they really wanted to do was decompress at the house. A day of planned activities was NOT what they wanted to do, and that included one female client whose mother wanted to take her to wally-world for basic shopping.