From Unofficial Stationeers Wiki
The Lander currently functions as a starting point on some of the planets/moons. It provides starting gear and has (yet) no additional function, and The seat is not usable yet.
It is advised if on a World that can Storm in the atmosphere, to take all the starting stuff off of the lander like the Portable Tanks, and Crates. Then Wrench them onto Tank Connectors, and Container Mounts respectively. This is because the Lander gets damaged from Storms, and if the lander breaks in a Storm then you can lose everything that was attached to it.