My brother-in-law was going through a separation a year ago and began tracking his wife's location. He would boast about it to us like he was being so smart about his actions. In the end he found out she was seeing other people as he equally was himself but they still ended up getting back together & continue too track each other. There is a lot of mistrust now in that marriage that I'm not sure how it's going to end up.
I don't think it's a good idea to be tracking your significant other in any way. It rarely leads to anything positive for the relationship.