For the HAM license, I don't think I can get one due to my age, and my dad doesn't want to get one. If I can get one at 15 years old, that would be great...
OK, first things first. If your Dad won't allow you to get your ham radio license, well.. that's it, until you're 18. Gotta go with the parental units. But, if your Dad's just unsure of whether you (a) can get a license at your age and/or (b) isn't sure what you'd be getting involved with if you got your license, I may be able to help with that.
I teach high school here in Fort Worth (Texas).. multimedia and engineering. In addition to having been a ham since I was in high school (more than 40 yers ago - yeah, we even had television and indoor toilets, then! :neener: ), I sponsor the school's ham radio club, and teach a unit on ham radio to my engineering students and the license class to non-engineering students who are interested in ham radio, as well. So, I do have a little bit of experience with explaining ham radio to parents who are seriously hearing about it for the first time.
See the pix below? That's my last class of kids, as young as 14 if I remember right, that got their license. There's no age limit to it, and the only cost is for the testing fee (usually about $14 if you study and pass the test the first time). If your dad has questions about what it's all about, or how much money you might have to invest, shoot me an email (my school address is in my signature line) and maybe your Dad and I can get together on the phone or via email.
I looked into getting GPS for it, but $600 for the reciever and $200 for the transmitter is way too much.
Using a GPS IS possible, using the Bee/GPS unit and a handie-talkie that decodes GPS data packets. But, there's an easier way that's been used since the first days of radio: direction finding (also known as DFing).
Basically, you point a directional antenna in the direction of a transmitter, and that's the way you go walking. It's not as easy or quick as using a GPS unit that tells you where the rocket landed, but it's a lot less expensive. With a little bit of scrounging and some effort on your part, you could build a directional antenna for less than $10 in parts, find a used ham walkie talkie for about $100, and build your own transmitter, or purchase one for less than $100. That's a lot less than what a GPS system would run you.
But, your age does bring up another question for me: you said you wanted to build a 2-inch rocket that would go up to a mile. That's probably going to require the use of a rocket motor in the H or I impluse class, both of which are not available to you until you're 18, unless you have an already high-power certified flyer that's willing to sponsor you for the NAR Junior High Power Certification. Is that the case?
There are some alternatives, as well... especially if you're going to be flying with a club (and I'd really recommend finding a club to fly with!!!) where folks already have the receivers you need to track rockets - then all you'd need is a transmitter of your own and borrow the club's receiver. All kinds of possibilities.
That help any?