Skimmers are vehicles that hover above ground level using anti-gravity drives, huge turbofans, supernatural energies, etc. Note that these are not full blown flying machines, they generally hover at a few metres above ground level but are capable of making a powered boost to gain height and cross obstacles. Skimmers can ignore terrain as they move but if they begin or end their move in difficult or impassable terrain they have to test to see if they are immobilised as noted for ordinary vehicles above. Immobilised skimmers are destroyed.
Skimmers
Source: Core Rulebook 3E, p. 80
Skimmers hover above the ground and ignore terrain as they move, but are destroyed outright if immobilised in difficult or impassable terrain.