Base Jumps are an Activity in GTA IV: The Ballad of Gay Tony. It becomes available after completing High Dive .
Use a parachute to jump off 15 designated locations across the Liberty City
This is an optional endeavor, but it is required for 100% completion of the game. It's not time-sensitive, meaning it can be played at any point, even after the main storyline is completed.
This side activity is also present in Grand Theft Auto V.
Base Jumps - Activity Details:
In Base Jumping, the player has to parachute to a specific location from a high point. There are 15 Base Jumps to complete, marked on the map with pink Parachute icons. These Base Jumps are split into 3 categories. Completion of Base Jumps does not award money but is required for 100% Completion of the game.
Base Jumps: Categories
The most common type of jump, which involves jumping off of a tall building in Algonquin and going through checkpoints. The landing point is stationary, usually on the street.
Similar to the previous categories, but the starting point is an airborne helicopter instead of a building.
Base Jumps: Mission Info
- Game Edition GTA IV: The Ballad of Gay Tony