Strange behavior occurs, that can be reproduced upon few tries on iPhone4 
Safari (not simulator).  Below is a hosted example of the attached file:

http://random.hypervolume.com/map_overlay.html

In this example you see a custom blue marker, that is implemented as a 
custom overlay. When panning into an area where tiles are not yet loaded, 
sometimes the marker jumps into a weird location.  It appears that that is 
happening because "draw" is called at an inconsistent state.  The problem is 
seen after about 5 to 10 panning attempts, into various directions around 
the marker, usually two viewports away from the original marker.   

This is observable on iPhone4 but not a desktop browser, since iPhone4 
renders slower.

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Title: Google Maps Sample

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