Ghost Recon Breakpoint takes place in the huge map known as Auroa, and it has a hugely varied terrain, with high mountains to scale and deep trenches to explore. It takes quite a while to cross the map on foot, and even when utilizing the game's many vehicles, which makes the handy Fast Travel feature really useful and a massive time saver.
There are limitations to using Fast Travel within the game, and it will need to be unlocked before you can use it. To unlock the feature, you will first need to have completed the Eagle Down mission, which unlocks Erewhon, the main hub within the game.
Once Erewhon is unlocked, you'll be free to fast travel to three locations on the map, a Bivouac, Erewhon itself, or anywhere your teammates are located on the map.
To utilize the feature, you can simply go to the main menu, select TacMap, hover over the location you wish to fast travel to, and hold the button prompted on the screen.
Keep in mind that the feature only works when you're not in a combat situation, and you can't be parachuting or falling, for example.
The good thing is you can unlock more Bivouacs throughout the map to increase your Fast Travel options. You can unlock these by collecting intel to discover their locations or by coming across one when exploring.
The easiest way to do this is by vehicle or flying to try and discover their locations. There're pretty easy to spot as there is usually a distinctive smoke coming from the camp fire visible from some distance.