I’m currently working on a Class 3 project for Balls next year, which should reach an altitude of around 250,000ft if all goes as planned. I have some questions on the best trackers and altimeters available that are somewhat cheap. The only high altitude trackers that I have found to work over 150,000ft are Kate and Aim Xtra, both nice systems but the I’m scared to use the Aim with not as many systems out there and really no history of high altitudes. As well, I do not have a windows computer, by the time I’m done with it, it’s probably be more than the Multitronix Tracker. I very much trust Kate, as the altitude is unlocked on his system, and giving the data and coordinates real time is a nice feature, is there any other trackers that’ll work at these altitudes? As far as the Altimeters go, I plan on using atleast 3-4, and a couple of timers if I can find some. The ones I am looking at are Raven and Marsa, they seam to be the most trusted, by far not cheap at all, but these are the only ones that I can find that are reliable, I Mn thinking about having a timer in each charge, and guessing the exact time it takes for the rocket to burn out and cost, than return back, luckily with not much air, I will have some play in that, as an ultimate backup.