Mark,
Are you aware that the Geo Stamp Plus will super the GPS on video?
It is limited to NTSC standard def.
http://www.icircuits.com/store/prod_osd_gpsoverlays.html
Suggestion-
Shoot in HD in the air with GPS through geo stamp and place GPS on the audio track.
Dub the tapes to SD through the Geo Stamp and record the GPS super on that video. Same Time code.
Let the client view the SD on any format he wants.
The time code should carefully be the same on all formats.
At any time he wants to view the footage in HD, use the same time code to locate that footage in HD.
Ray Palmer, Engineer
Salt River Project
Phoenix, AZ
602-236-8224 office
There are three types of people in this world, those that can count and those that can't.