These things would likely not help very much for rocket tracking. I have a Trackr on keys for when I misplace them in the house. I haven't tested the Trackr outdoors and I believe the makers of all these devices make lavish promises.
Works within two rooms in the house. Range is not likely to be very far outdoors anyways. Will probably give the last known position as to the last it accessed your phone GPS plus you'll need an internet link.
They are tied by Bluetooth to your phone and your phones GPS provides positioning. If your phone doesn't have a GPS lock where the device is "last seen" you could be sent on a wild goose chase. Again, there is no GPS in the device and
I suspect totally useless for rocket tracking. Plus the software requires "overhead" and battery power. At least the Trackr tries to recruit one for "crowd finding" so your device is used to plot postions for somebody else's stuff nearby.
If you're paranoid, stay away. Trackr I keep crowd "tracking" turned off. But again, I only use it for my keys.
Oh, I forgot to add at least with the Trackr, the program does have a signal strength meter on it so as I wander through the house (swearing under my breath) as I get more bars on the signal strength meter I know I'm getting closer.
It doesn't need an internet link for that and I usually have my memory jostled to find my keys. The beepers on these things aren't very loud. I expect a louder rocket screamer would be more effective. Indoors I've not
seen more than 15 feet. Kurt