Firmware Version 2.0.2 incorporates the following fixes:
When updating the firmware of the camera, please review the instructions thoroughly before you download the firmware.
Please note: Do not downgrade the firmware of the product to Version 2.0.1 or earlier after updating to Version 2.0.2. To update the firmware of this product, Map Utility that is bundled with the product is required. Furthermore, before updating the firmware, use Map Utility to save the GPS log files in the built-in memory to your computer. After the GPS log files are saved to your computer, make sure to delete the log files from the built-in memory of the GPS receiver before updating the firmware.
Download: Canon GPS Receiver GP-E2 Firmware v.2.02
B&H carries the Canon GPS Receiver GP-E2.