He won't end up with a record. It's no different than a speeding ticket.
I had an issue many moons ago in my teens where I thought I was not in sanctuary water but because I was just upriver of the down stream side of a bridge I was considered in the sanctuary. My mistake and I paid the fine and all is done. It happens, pay your fine and get on with your life.
I went to court anyway and had the fine cut in 1/2. So if your time is worth $90 go, if not pay the fine.