WX Course is the most perfect and efficient app to have your data GPS and compass on your Apple Watch. WX Course send the next GPS data from your iPhone: - Course (COG) - Speed (SOG) - Latitud and longitude - Accuracy of GPS signal Include a second screen with a real compass with COG data for S0, S1, S2 and S4. NOTE: Continued use of GPS running in the background can dramatically decrease battery life.