Never been in Briggs employ, but you'd be amazed how many managers, even company directors I've worked for over the years 'find time' to watch the trackers.

Service manager - "why's it taken you 2hrs to go 5 miles'?"
Me - "I'm in central London, I've set off from Oxford street and arrived in West Acton, have you ever worked in cental London?"
Service manager "Well... No"
Me - "naff off"

Service manager -"why have you been parked on the M25 for 3 hours?"
Me - "check the traffic reports and stop being a tool"

Now it's "your pda' s been off line for 4hrs". "Well I'm servicing 6 trucks on an apple farm in the ar@e end of nowhere, you know where the customer is, you sent me here".

Stuff like this beats you down eventually, the jobs stressful enough at times without your superiors pestering you with petty nonsense all the time.

Your bosses always find time to watch the trackers... Always...