On Saturday, February 21, 2015 at 2:53:54 PM UTC-8, Bob Pasker wrote:
how do I borrow/rent an appropriate flight data recorder?

Assuming you are in US, one option is the FlyWithCE FR300, which is an SSA approved "GPS Position Recorder". This is good for your Silver and Gold badges, OLC, and SSA contests. At $140 won't put a big dent in your wallet (and is not much more than the cost of getting a dusty old barograph calibrated):

http://wingsandwheels.com/old-site/f...xx_gps_dat.htm

Just remember that you need an extra 100 meters for your badge altitude gains...

Marc