The last few weeks have been tough because just when we thought the firmware was about ready to go, we ran into a bug that happens infrequently, but would make a unit non-functional until it's re-programmed. Well, we squashed that but and a few more, so we're getting ready to move on to the next testing phase. I'll be contacting people on the beta test list over the next few days to confirm that they are ready to go.
The other good news is that we've also checked one of the "advanced features" off on the list: Multi-stage support. Below are 2 screenshots from a single ground station being used to track two different trackers on two different frequencies. (Click on them to see them in full resolution)
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The information for the Ground Station (the part that you keep with you) is on the left, and on the right the display shows data from the tracker that goes in your rocket. The colored bars in the middle indicate how many satellites are being tracked, and how strong their signals are. Orange bars are weak satellites, yellow bars are o.k. satellites, green bars are satellites with good signal strength, and blue bars are satellites with very good signal strength. In this demo, I was indoors under a metal roof with the ground station, which is why it is locked onto relatively few satellites. The trackers representing the booster and the sustainer stage are on the right, and they were outdoors with a clearer view of the sky. If you're wondering whether your carbon fiber nosecone will prevent good GPS performance, this screen can answer that for you at a glance.
The icons at the top left and top right, respectively, indicate that there is a connection from the phone to the ground station and from the ground station to the rocket. The battery voltages are also shown on this page, so you'll always know if your batteries are good to go.
To switch between displaying data from the two trackers, just select the other unit from the "wheel picker" at the bottom right. Of course, you can also use this feature to conveniently switch between trackers that you may have in several rockets. The "Booster" and "Sustainer" text is a public ID for your rocket that can be whatever you want it to be (up to 11 characters), like "Jims Saturn" or "AA Mongoo24." This ID will show up in an upcoming status page that you can use to follow along with other people's flights.