Lilly has known for a long, long time when you leave the house, where you drive the company car during the day, absolutely everything.
So quit fooling yourself thinking that a GPS is a new-fangled contraption that Lilly uses in a 'Big Brother" fashion. They already know.
There are videos of you shopping at Wal-Mart during your "busy" work day. There are videos of you sitting in a bar or a strip joint while "making calls", etc. There are videos of you sneaking into a no tell motel with a lover while "at work".
And you worry about a GPS! Geez.