
Unlike the Drive To instruction (which can also be used in its Go Via mode), Way Point instructs an engine to head that-a-way. Simple to use because it offers no options, Way Point allows you to plot an engine's path marker by marker if you wish, but usually it's only necessary to choose a marker that lies in the appropriate direction and is accessible from the engine's previous position. The drawback is that the red path line will not extend to the Way Point's position.
I've found this tool particularly helpful after the editor has hastily and insistently reported that an engine cannot get from point A to point B, even though any fool (including this one) can see that the path is open and available. Sometimes changing the editor's mind is as easy as 1) deleting the failed Drive To of Go Via instruction, 2) placing a Way Point that leads beyond the marker I want the engine being edited to reach next, and then c) reinserting the Drive To or Go Via, although at times it's necessary to save, quit, shut down, relaunch and reopen between steps 2 and c. If even that fails (and the editor-dispatcher combination's innate stubbornness, as all scenario writers know, is inestimable), more drastic steps such as shutting down and restarting the computer or even performing a cache verification may be needed to appease the aforementioned deities.
I can't and won't state that this always works, but at least it's well worth trying rather than giving in to TS's quirks.
Happy editing!