An ad-hoc element representing a group of waypoint elements.
In a group of top-level "wpt" elements, these points will be represented discretely.
In a "rte" or "trk" element, these points will be represented as paths.
Status messages returned to the calling class after an elevation cleanse request.
A "cleanse" is an attempt to fill in any data that was missing from the server's response (SRTM voids).
Status messages returned to the calling class after an elevation correction request.
A "correction" is an attempt to replace all elevation data with SRTM data from the server.