Altered Course. This is a standard short hand format that is commonly used in logbooks to confirm a change in course.
Course over the ground This term describes the ground track or the proposed ground track of a vessel.
Distance made good. Used to determine the actual distance a vessel has travelled in a straight line when tacking.
Dead reckoning position. A position found using speed, time and a heading or heading and distance run. This is not an accurate determination of your position.
Distance to waypoint. The distance to the next waypoint or destination.
East Cardinal Mark.
Estimated position of the vessel. Used when a position is worked out from the course, speed and leeway.
Estimated time of arrival.
An accurate position of the vessel.
A commonly used acronym for a Fairway mark.
Ground track. A line marked drawn on the chart denoting the proposed or completed course over the ground of a vessel.
North Cardinal Mark.
South Cardinal Mark.
Speed over the ground. Describes the speed of a vessel over the ground including the effect of tide.
Track made good. Gives the average course over the ground a vessel has made from the start point it's current position.
Time to go. Time to the next waypoint or the destination.
West Cardinal Mark.
Waypoint. A small box plotted along the proposed course of a vessel. Usually marking a destination or change of course. This point would also be programmed into your GNSS.
Cross track error. Used to denote how far a vessel has strayed from the plotted ground track.