If you want to compare the precision of various positioning methods: http://en.wikipedia.org/wiki/Wide_Area_Augmentation_System#Comparison_of_Accuracy http://e

If you want to compare the precision of various positioning methods: http://en.wikipedia.org/wiki/Wide_Area_Augmentation_System#Comparison_of_Accuracy http://en.wikipedia.org/wiki/Wide_Area_Augmentation_System#C...