Frwd has a GPS device with altimeter. http://www.frwd.com/ A freestyle team here in Finland is sponsored by this company. They have mounted these devices to side of their rigs. PC software can make 3D figures of your jump and you can also add data from multiple devices to one figure (e.g. to compare 2 wingsuit flights). I'll make a wingsuit jump with this device soon and post some results here..
Drawback of the "standard" model is that it records your position only once per second, but e.g. these devices here have been changed to make recording a bit more often. Price is still also pretty high 849EUR for basic model and 1212 EUR for some "professional" model.. - Oikku
