> The GDirections, always reset the map?
> Is there any way to force it to mantaining the zoom level?

See the documentation
http://code.google.com/apis/maps/documentation/reference.html#GDirectionsOptions.preserveViewport

> Because if
> the user refreshes the map, the position and zoom will be reset every
> time...

Getting the same GDirections every time the map zooms is clearly a
waste of resource, and you may run into problems with numbers of
requests.   Save it.

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