One route waypoint or control point.
the point's display callsign.
latitude in degrees × 1e7.
0 = waypoint (b-m-p-w), 1 = checkpoint (b-m-p-c).
b-m-p-w
b-m-p-c
longitude in degrees × 1e7.
the point's UID (a deterministic one is generated on build when empty).