Onboard gps units tend to drop out at high altitude and/or high velocities due 
to COCOM limits. Some will re-acquire at apogee but it doesn't always work.  
I'm planning for onboard telemetry but a multilateration system is the backup. 

I correspond with others on aRocket and unrestricted gps units still aren't 
available to the average person without a lot of paperwork and $$$.

-Bob

On Jun 6, 2012, at 22:13, Chris Albertson <[email protected]> wrote:

> Why not fly a tiny GPS inside the rocket?  Either modulated the beacon with
> the GPS serial data or record it to a micro SD card.
> 
> 
> On Wed, Jun 6, 2012 at 7:33 PM, Robert Watzlavick 
> <[email protected]>wrote:
> 
>> Sorry to resurrect an old thread but I also have a question about using
>> the Thunderbolt in the future.  I'm considering using 4 of them in a
>> multilateration setup to track an amateur rocket with an onboard beacon.
> 
> Chris Albertson
> Redondo Beach, California
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