I haven't heard anyone mention pokemon go as a potential reason for her being at that park or for seemingly driving around aimlessly. It was 4:30am, so that rules out so many locations someone might go to during daytime hours. What you have to realize about pokemon is that there is also a factor regarding terrain that determines what type of pokemon spawns. For example, Toni might actually go to a spot near a river to get water based pokemon.
Next you have the idea of why would she even get close to that boat ramp? Well, that's kind of the knock on pokemon is that people tend to wander into places that maybe they shouldn't be, to catch a pokemon.
Nothing definitive, but I think it's a solid question to ask. I haven't played pokemon go in many months, as I said, I know people that still do. I still encounter people doing it out and about, and it's not at all hard to spot.
So whether it checks out or not, it would explain so much imo.
Just a little tidbit about using multiple gps devices in close proximity :
[FONT="]Two receivers of the same electrical design could interfere with each other if placed in close proximity since the processing signals from one receiver could radiate from its antenna and cause interference to another.
[/FONT]Not saying this is a high probability, but very easy to test. When playing a game like pokemon go, interference can result in what is called "drift". Meaning that your location on the map can become erratic and drift in an arbitrary direction even if you aren't moving. So in general a reduction of the accuracy of the gps location. So... just pointing this out to say, is it possible that Toni removed the GPS device because it was causing problems with her pokemon go?
Worth mentioning on this topic.