He may not be dating. He may be out there surfing the net to see what's available, or these sites were initially logged into before he confessed his infidelity. I'm not surprised that he visited those site, but again, we can't "assume" that he's still visiting them.
As for the tracker, evidently he is trying to prove to you that he's not out there running around. If the app is on your phone, definitely remove it. It is creating a lot of issues for you and you do not need to know what he's doing because you are separated at the moment.
Unfriend and block him from your FB page. If you want to show him photos upon your return, you can do so if you want to. He doesn't need to know everything you are doing.
Glad you have someone who is going to stop by and check on the animals.
Breathe! Step back from the snooping and if something should pop up on your phone or computer that looks like something you don't want to see....send it to the trash bin.
From this day forward, it is time for you to reclaim yourself and focus on your trip. BTW, did Halifax survive Dorian and your friend is okay?
Barb, the one thing I truly had to learn was that I couldn't control anything that my spouse was doing...the only thing I could control was how I reacted to it. If you haven't done so, read the detachment thread. Detaching takes time, but it will help you learn how to not react to all that he does while you are separated.
Try to enjoy your trip and travel safely.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.