Ok I know what you're gonna say, I should never have allowed this in the first place... but DM is one of those that will want a text or call "when you've got home" always, allowing no time for traffic/ stops for food toilet etc or you know just doing normal getting home activities like putting tea on, feeding pets, unloading car etc. A text if not replied to within 5 mins turns in to a call if not answered (not ignored just busy) she'll call DH and if that unanswered again not ignored, landline and of course panic stricken messages left on each.
Soooo as so to avoid this I signed myself and her up to one of those family tracking apps, great I thought !!! She gets a notification straight to her phone when my phones tracked down my street. Sorted !
However I work away a lot for work, sometimes at short notice often a good couple of hours from home. If she's not received prior warning I'll get messages saying... what you doing in Manchester? (for example) and I'll explain... not too bad if it's an isolated event. It it happens most shifts.
The past 48 hours I worked away, originally for one day then another shift in a London borough came up so I found a cheap B and B and stayed over as really need the money. Mums already clocked yesterday's area so I tell her I'll be in London today.
This afternoon she texts me and says, you're not in London you're in Kent!!!!! I say that place is a London borough (backed up with google screenshot saying as such!) but silently rage to myself that I shouldn't have to be justifying my position in the country !
En route home tonight I stop at the local 24 hour supermarket so I don't have to drag DD out to shops tomorrow.
You guessed it...
DM: why have you stopped in x?
I text back, "stopped at supermarket"
I'm in no rush but 20 minutes later...
DM: are you still at supermarket?
So I call her and say half joking stop tracking me !!! Oh I just wanted to see you got home she says, I say that's fine but I'll turn it off if not used for it's original intended use. She apologies and literally hangs up on me.
Then I get a text. "Just checking you got home ok- sorry to be soooo caring. Goodnight" 
So she's a lovely person but just over anxious I guess. Worrying about me getting home doesn't bother me but Aibu to not want the constant questions about why I'm places (99.9% always for work anyway !) and if she will follow my whereabouts to do it without me knowing?!