I dont care if its there as long as its not the only tool used.Your brain Example this tech has 64 qt of oil billed on his truck.30 is in parts bin waiting for him to pick it up 45 billed on work orders 15 left on his van.Now 26 qt of oil appeared out of nowhere that has 5 matching filters that we have just been blessed with cause he sold the 5 he had and we just so happen to have found 5.Now he also has 2 hoses that have been put on on this bill signed and turned in with matching hoses in his van floor.This tech takes 3 hrs to put on a hose when most tecks take 1.5.
Gps could be a good tool.Or it could be the 30 amp fuse in the 5 amp socket. Its all how it is used.