GPS modules

The following GPS modules have been tested with the lap timers:

GPS Module	Pros	Cons
TomTom Car Kit	Includes speaker Includes Bluetooth hands free Includes (is the) iTouch mount Charges the iTouch	Slightly harder to position iTouch properly Requires an extension cable to use with an iPad Requires an extension cable to mount "remotely" from iTouch Not suitable for placement outside the vehicle (like on the roof)
Bad Elf GPS Receiver	No rechargeable battery to worry about Will soon support 5Hz and 10Hz high resolution GPS updates	Requires an extension cable to mount "remotely" (on the roof of a car) from iTouch Optionally requires a iTouch mount
GNS 5870 MFI GPS Bluetooth Receiver	Easy to mount anywhere	Require Bluetooth pairing with iTouch Need to remember to keep the battery charged. Easy to turn on/off accidentally Optionally requires a iTouch mount
Dual Electronics XGPS150 Universal Bluetooth GPS Receiver	Easy to mount anywhere	Require Bluetooth pairing with iTouch Need to remember to keep the battery charged. Optionally requires a iTouch mount