A poorly performing fleet is a massive challenge for any business; mainly if it's a part of the logistics and transportation industry because logistics isn't just a business function that they have to manage, it'is their whole and sole business! Being in the transportation industry isn't a child's play, after all. You have to maintain a large fleet of vehicles, which is a reason for a mild headache even at the best of times.
If you don't know the precise location of every vehicle in your fleet, your business will have to depend on a lot of guesswork. That, as all fleet managers would agree, is a situation best avoided!