I know this question has been asked before, but if my metal detector fits in my carry on, should I take it on with me...most people say luggage, but has any one carried their metal detector in put it in overhead
I would hand carry the control unit and anything hard wired to it. The rest...batteries, shaft and scoop put in checked bags. Always check with the airline you've booked with though for questions. They are subject to steep fines by TSA and FAA if they are found to allow someone to fly that is not in compliance with CURRENT regulations, so they are up on ALL the rules because they are in business to make money not give it away.
THE REST OF MY PACKED GEAR FOR TRAVEL
I usually take
2 - scoops - large breakdown model - medium breakdown model or a hand scoop
2 - masks w/snorkels
2 pair dive boots
gloves
2 - mesh bags
spare lower rods
extra batteries (some countries charge a fortune for batteries- triple what they cost here)
repair/equipment pouch - zipties, ducktape, spare washers, plastic screws/ bolts, dive knife
screw drivers, even a small hammer
wet suit or wet jacket if needed
usually will put spare towels under and on top to stop excessive rattle