How accurate are class A and B locations (empirical data on class A and B)?
Class A and B locations may be accurate. We cannot specify the accuracy, since more messages are needed to estimate the error. We can just say that class A locations are usually more accurate than class B locations, because the transmit frequency has been computed thus enhancing the process. Some users have experimentally tried to answer this question and provided interesting hints. We are confident that approaches of this type will help provide interesting guidelines to enhance practical use of this type of locations. What is the impact of platform altitude, can it be limited? The location calculation assumes that the platform is at a fixed pre-defined altitude. An error on platform altitude translates into an error varying between half and four times this error on longitude. To enhance location accuracy, CLS applies a digital elevation model (DEM) from the USGS to all location calculations for terrestial mobiles and birds. Composed of basic squares of 30 seconds of an arc (900 meters
