[roc-chat] Re: GPS unit speed and altitude limitations

Which is why the application fee is $1,000.  But I do have customers that
have done it.  You just have to show you are legitimate.

 

Tom Miller

Black Magic Missile Works

 

From: roc-chat-bounce@xxxxxxxxxxxxx [mailto:roc-chat-bounce@xxxxxxxxxxxxx]
On Behalf Of Greg Clark
Sent: Tuesday, December 27, 2011 9:52 AM
To: roc-chat@xxxxxxxxxxxxx
Subject: [roc-chat] Re: GPS unit speed and altitude limitations

 

So how can one sell a GPS to the general public that removes the COCOM
limits?  I thought you had to go thru an appeals process and be granted an
exception on a case by case basis....

 

-- Greg

On Tue, Dec 27, 2011 at 9:35 AM, Tom Miller <Tom@xxxxxxxxxxxxxxxxxxxxxxxxxx>
wrote:

Garmin GPS that I supply with my UFC series flight computers interprets the
rule to be altitude AND HORIZONTAL velocity.  If you want to pay a lot more
the NovAtel GPS I offer  removes all restrictions with an application and
additional fee.

 

Tom Miller

Black Magic Missile Works

 

From: roc-chat-bounce@xxxxxxxxxxxxx [mailto:roc-chat-bounce@xxxxxxxxxxxxx]
On Behalf Of Greg Clark
Sent: Tuesday, December 27, 2011 8:55 AM
To: roc-chat@xxxxxxxxxxxxx
Subject: [roc-chat] Re: GPS unit speed and altitude limitations

 

Notice that they say high speed AND high altitude.  Many manufacturers
(including the SiRF III pictured) implement an OR function.  I believe (but
can not confirm) that the velocity component is 'speed over ground'  so most
rockets will never into this limit unless they're heading into orbit.

 

I have yet to see a data set from a rocket that exceeded both of these
limits, so can't confirm what really happens.

 

The balloon guys have compiled a pretty comprehensive list that show which
work, and which do not above 60k. http://www.arhab.org
<http://www.arhab.org/> 

 

-- Greg

On Tue, Dec 27, 2011 at 8:11 AM, Chris Spurgeon <chris@xxxxxxxxxxxxxxxxx>
wrote:

The Make Magazine blog has a little discussion of the hows and whys that GPS
units cut off at high speed and/or high velocity.

 
http://blog.makezine.com/archive/2011/07/gps-units-disable-themselves-if-the
y-go-faster-than-1200-mph.html


Chris Spurgeon
chris@xxxxxxxxxxxxxxxxx
twitter.com/chrisspurgeon





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