a map with a track from a gpx file reduced to 100 points, centered on the track:

[[!googlemaps trackfile="sample1.gpx" tracklen="100" controls="type" center="track" id="track1" width="600" height="400" key="ABQIAAAARMyeKjM8bZg0lRu49zgdRTDhOPBEOLVQeAnKvNKQOlppSlf1RReNiUMuhuFpqWkheOKBSmxwem4A"]]