Adds Global Positioning Satellite (GPS) receiver capabilities to the SunEye. Communicates with the SunEye via wireless Bluetooth interface. Permits automatic readings of latitude and longitude for sunpath calculations and displays. Each Skyline reading can be automatically tagged with the latitude and longitude coordinates. Recommended for large sites where many skylines will be recorded, or when exact latititude/longitude coordinates are desired. Accuracy is +/-3 meters. Accessories with GPS option include: belt pouch, GPS car charger, GPS charger, neck strap extender with GPS module holder.