What is the difference between a distance ring and an altitude ring?
A distance ring indicates lines of equal distance from a given landout. This is similar to the traditional method of marking up a sectional for cross country flying using a compass and pencil. Marked on each distance ring is the calculated altitude required to make it back to the associated landout, using the current flight parameters. Note that even at the same distance, these values will be different for landouts at different elevations. The areas where rings overlap are omitted for clarity.
