Humminbird NS25 Operation Manual page 69

ROUTE
A series of waypoints stored for navigating to a specific location.
TD's
Time differentials from Loran stations.
UTM
Selects position readout in Universal Transverse Mercator, the coordinate system used by some
maps (such as USGS topographic maps).
WAYPOINT
A point of interest stored and included in routes.
XTE
Cross Track Error. The XTE is the distance between your position and the desired route.