Hello, I need to find information if SUP500F will work at very high altitudes like 22 000 m.
We are taking part in a stratospheric UAV project. Do you know the manufacturer of the SUP500F?
Thanks, Marek
The SUP500F has a spec limit of 18,000m which is a pretty standard limit in terms of the GPS modules sparkfun carries
I have talked to Skytraq about it before and their venus chipsets have a spec limit of 18000m OR 512 m/s. As long as you are not going over 512 m/s over 18000m, it should work. Are you sure this particular Skytraq module has that hard limit?
P.S. where do I send new products designs/etc for sparkfun to consider? I built a bunch of gps modules and sent an email to show them off a long time ago, but never heard anything back. 
The limits come from the national defense standards I believe, so often either the speed or altitude are limited. If you haven’t already, here’s something pretty cool to check out; http://showcase.netins.net/web/wallio/G … s60kft.htm .
If you have a cool design, send a request to techsupport@sparkfun.com and they’ll send you information on getting it to the proper people.
It is the result of export restrictions on munitions. You can purchase (with some effort and extra cost) GPS receivers that have neither limit but you must agree to never export it. That is a federal crime that will get you locked up for a long time.SFE-TS-Pearce:
The limits come from the national defense standards I believe, so often either the speed or altitude are limited.
The [munitions list is interesting reading.
The entry for GPS is (in part):
(c) Global Positioning System (GPS) receiving equipment specifically
designed, modified or configured for military use; or GPS receiving
equipment with any of the following characteristics:
(1) Designed for encryption or decryption (e.g., Y-Code) of GPS
precise positioning service (PPS) signals;
(2) Designed for producing navigation results above 60,000 feet
altitude and at 1,000 knots velocity or greater;
](http://www.access.gpo.gov/nara/cfr/waisidx_09/22cfr121_09.html)