Basically G3 is expecting an equirectangular image (360 x 180 degree field of view) and ideally 8192 pixels by 4096 pixels.

Here is a guide to G3 panoramic images ...

http://www.rcuniverse.com/forum/m_33...tm.htm#3381125

more links in the Photofields (how to create them) bit ...

http://www.knifeedge.com/forums/showthread.php?t=11067