Gyrostabilizer is a tool that immediately stops you from moving. This is helpful in zero-gravity environments, for dodging enemy projectiles or for mitigating the fall damage.
You can use Gyrostabilizer to hang in the air, but because it drains energy while active, this can only last for a short time. It may be more efficient to use Physics Field tech instead.
Keeping the Gyrostabilizer active prevents you from walking, but you can still use techs like Air Blink or Physics Field.