I've been following CJ's punisher thread (I'm building my Punisher as well) and noticed your question, Chris.
Awesome build as usual Jim. Have you been able to use the Missleworks GPS yet? Looking forward to that.
You got CJ's first impressions on the RTx system, so I figured I'd post a "post LDRS /High Skies in July" update. I'm extremely close to handing off the alpha hardware units with my potential beta firmware to a few beta-testers. Been tweaking code since LDRS and since last weekend's 2 alpha flights. The firmware is nearly complete and the hardware has been performing extremely well. The uBlox7 chipset has been outstandingly accurate.
Along with additional alpha board tweaks I'm also working w/Landru to create several new 3D parts that will package this thing and provide unique mounting configurations. Another large part of these alpha tests has been antenna configuration testing, and there's still many tandems of antenna types and designs I'm playing with.
The RTx system is configurable into (8) unique operational modes which are 100% DIP switch settable... no PC, no tablet or smart phone, just flip and go.
Naturally, there are additional advanced settings you can configure, but out of the box this system is "buy and fly" and is "plug and play" friendly with the m3 Module family (LCD, USB, and the new modem/Bluetooth module). It's also "plug and play" friendly with the RRC3 which provides complete in flight telematics data with real time events, altitude, flight time, vertical velocity, etc...
The RTx system also provides a complete navigational solution without any PC, smart phone/network, tablet, or handheld GPS. It autonomously guides you to the last reported rocket location even when packet sync is lost, displaying your current speed and bearing over ground coupled with real time updates to rocket bearing and distance... truly trivial and hands free "no fuss" recovery.
Here's some obligatory rocket and sled pics, showing what we've been testing so far.
Stay tuned for more updates as we expand to "beta tests"!