Sea Angling Ireland

I have a macliner 17 that i want to hook a fishfinder on to without drilling holes in the boat.i was thinking a box or something that the base can just clamp to so i can remove every time

Garmin do a portable kit to suit fishfinders. Generally a pain setting up and taking down after. If the only impediment is drilling holes I would think again.... drilling holes is not an issue if done well.