> When viewing this file in Google Earth all 27 tracks are shown but google
> maps only shows a handful of them. By loading the tracks individually i can
> get it to load more but after ~25 I get a js error as the "URL is too
> long".

There are limits to how much work you can give to KmLayer
http://code.google.com/apis/kml/documentation/mapsSupport.html

> Also is it possible to change the colors of the overlays through some
> outside source or does it have to be done manually through the kml.

Not using KmlLayer ; it is possible with a client-side parser like
GeoXml3 but there are performance penalties.

I suspect you'll need another strategy altogether for 60 complex
lines, maybe your own tile-rendering server.

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