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RockBlock Sat based module
If you get the weekly Sparkfun new product emails you probably saw this... this could have use as a satellite based tracker in a high dollar Black Rock flight or similar, in place of RF tracker or perhaps as a redundant tracker.  Minimum dimension for the bare device is 76 mm which is a tad on the fat side.  The price on the manufacturer site is ~ 180 USD. 


Nice that you can pay as you go for the Iridium service.
Member of MDRA, NAR and NARHAMS;
Level-2 certified but mostly fly G and under;
Volunteer compiler of manufacturer's news for ROCKETS Magazine.
Pretty cool overall. The "naked" module is only 51.5 mm wide, but 19mm high so it is not going to sled into a 54mm tube, but should easily go in a 3" or better tube. You do have to pay > $10 for any month in which you use it. Requires external antenna and a decent battery (quoted 100mA @ 5V). Can provide inflight readings regardless of altitude as long as the GPS stays locked. No cell coverage or ground RF propagation issues...there's a lot to like here.
Dave Cook 
NAR 21953 L2    TRA 1108
That's really cool. I like that you can get two units and they can talk to each other anywhere in the world. Would make getting data back from a high altitude project very easy.

NAR# 98194
Level 1: CTI I-216, 3,043'
Level 2: CTI K-740, 5,999'

Personal altitude record: 12,400' CTI L395
2014 total impulse: 9,018.2 Ns (76% M)
2015 total impulse: 7,171.7 Ns (40% M)
2016 total impulse: 18,664.2 Ns (91% N)
2017 total impulse: 8,281.1 Ns (80% M)

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