Hadn't thought of that. I am going to check this out now.
Trying 26.9, 34.6, 28.2 this put me in Blueberry Acres in the air I fell down to 3.11 a 25 meter drop.
Trying 269, 346, 282 makes you free fall into the river just north of Blueberry.
Trying 269, 34.6, 28.2 makes you drop onto an unidentified building in Blueberry.
Trying 2690, 346, 28.2 is a drop onto Hankypanky Point in Palomino Creek.
Then 269, 3460, 28.2 most interesting here is a screen shot of where you end up.
When I swim due south I ended up here.
Got busted shortly after this shot.
I was using a clean game no mods so as soon as I hit the shore the 4 stars lit up. Coincidence? I don't think so.