Their website doesn't address GPS, it only says

Use of the following equipment is permitted during the flight: Laptop (with CD-ROM/DVD-drive), Walkman, MP3 player, CD player, Mini Disc player, Game Boy and video camcorder. Use of the following is still not permitted: Mobile phones, radio equipment, radio remote control, wireless mouse, Mini Disc

Bluetooth though is not allowed, they specificailly said no bluetooth or wireless printers, keyboards, mice or any other devices on a flight earlier this week.