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How can I convince my dad to take me tuna fishing with him?

I'm 13 and my dad goes tuna fishing a lot. It's 50 miles out of the land. My dad thinks that it's too dangerous because he has a AquaSport boat and it's not that big. He said that he'll take me if we go on a charter boat because it's safer but it's too much money. I want to go really bad for the first time and school is starting soon! HELP!