[gps]

Setting Type Explanation
enabled Integer 0 or 1 Indicates whether GPS support is enabled. GPS support currently requires a u-blox USB GPS receiver. Specific model to be specified later.

Note that if GPS support is enabled and no device is plugged in, nothing different will happen; it will be just as if GPS is disabled. You may want to disable GPS without unplugging it; that is where this setting comes into play.
usegpsheading Integer 1 or 0 This setting is currently ignored; the GPS heading will always be used when a heading is required (there is limited internal support for a digital compass which theoretically provides better heading information because it works when the vehicle is not moving, but as yet I haven’t found it to be reliable enough in the car’s environment due to magnetic interference from other devices)