only way I can think of:

- install an HSS capable flash on camera, set up for HSS operation.
- put the GPS device on a flash slave

You'll be able to use the full range of shutter speeds.
First burn will trip the slave and trigger the GPS unit.

Kinda clumsy, I agree, but it's the same situation with my panasonic
bodies. They only allow higher than 1/160 second for flash with an HSS
flash fitted.
-- 
Godfrey
  godfreydigiorgi.posterous.com

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