Help for Updated Elements
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The updated elements are the values used within mtrack for calculating the
current position of the chosen satellite. These are based on the values
entered originally and then updated through time, taking into account
changes in the orbit, including drag. The longer the time between the
original satellite data and now, the less accurate is this data, and
consequently the accuracy of the tracking data provided by mtrack. As a
general rule, the higher the orbit the less effect drag has, and the more
accurate the satellite tracking is, even after a longer elapsed time.