If you try and load big GPX tracklogs they may well contain too much detail (too many short legs) for display as a GMaps GPolyline. To work around this, the point set needs to be thinned. The classic algorithm for this is known as the Douglas Peucker algorithm.

You will find a client side javascript implementation of the algorithm here GDouglasPeuker.js

Given an array of GLatLng objects in trkPointsRaw, the call trkPointsReduced = GDouglasPeucker(trkPointsRaw,20); will reduce the points to a set with kink depth no more than 20 metres.

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