I think I can confirm NY being located at the southeast point of the map. I found this out after an odd glitch though.
Was doing Bury the Hatchet and checking places out for fun when I got an invite from a friend for tennis. I decided to join since I was kinda bored and couldn't be bothered finishing the mission, so I tried to join, only to be rejected because the maximum amount of players was already reached. When the game returned to single player, I suddenly found myself falling from high up on the sky towards the water, as the active mission was cancelled but my location was still in the game's memory. A quick look at the pause menu revealed I was in the southeast tip of the map.
- TheCornking101 likes this