GPS help and advice

> it splits long tracks into multiple pages when imported into My Maps

Did they give any clue as to the decision method for this splitting?  Number of points?  Distance?  If it's the number of points, you could address this by reducing the point logging rate.  You could even process the GPX to decimate* the track points.

* in the technical sense of discarding every nth sample (or, more likely, keeping every nth sample).  Metric Kate willbe able to explain the origin of the term'decimate'; it was a rather severe Roman punishment for an armed unit that didn't cut the mustard...

What does GoogleEarth do...?  It will import GPX files, too, with the advantage of 3D visualisation of the route.

From the name, I guess Google Fusion Tables is intended for data fusion activities, such as fusing route information with terrain or mapping information.