The thought strikes me, not knowing the law in the UK
, that for use away from model boat/Club activities it would be fairly safe to buy a cheap r/c toy and utilise the control system from it. The other solution is to make the boat tethered with a simple control line**, string
, cutting power to boat when it reaches the correct spot, acting as a rather large ‘float’ and holding the bait hung down from it. Perhaps two lines out to the boat … the string and the fishing line proper which when the fish is hooked breaks free from the boat ….. just some wild ideas as I write this …. there was a long thread recently on the subject here at Model Boats.
** I noticed such a thing in the forerunner of Model Boats ….Model Maker and Model Cars back in a 1969 issue just last night when I was searching for something else 