Change the default radio station

Currently, there's no easy way like the spaceship parts and letter fragments tracked on rockstar social club. But you can always go medieval and use a physical solution.

I found the fold-out map included with in the game box to be pretty useful for this. And once I've finished (almost there!) it'll make a cool (geeky) piece of art to hang in the media room.

The pins are map tacks found at a local store for under $6 total. If you're curious, green is bridges, yellow is jumps, white is letters, and blue is spaceship parts. I've yet to do any knife flights.

As for which bridges to fly under, there's no way to know without using a guide. I'm sure it's not hard to find one out there. But if you don't want to use a guide, you just have to keep trying bridges. I do have a couple tips though: Use a helicopter, it's much easier. Also, make sure you don't scrape the walls or top of the bridge with your rotors. Sometimes that causes it not to trigger. There are two bridges in particular where this is very difficult, so use a small helicopter like the Military one you can buy from the in-game internet.

The point is to locate a vehicle that won't give you wanted stars or give you a bounty for stealing it.

The feature definitely seems bugged, as that ATV is commonly what has been located for me, even if it is halfway across the map from my current location. You would expect the vehicle that is located would be in some close proximity to you