YouTuber DPJ Destiny has put together a video revealing one of the early secret vehicle locations you can visit from the very start of the game.
When you start the game after getting your first sparrow, head back to Old Russia and head through the Forgotten Shore until you reach the sea, you'll eventually have to dismount at the coast and wade through the water along the cliffs until you reach a chest on a small mound by the cliffs.
Opening the chest will unlock the new speeder, called the S-22 Nomad, which boasts 20 more durability points than the one you're given initially as well as enhanced speed.
You'll then need to head to your equippment page and select the new speeder to activate it as your default sparrow.
The exact location of the sparrow can be seen in the video below and you can also have a look at our dead ghosts location guide for Old Russia and the Tower.