Placing such a legend would be straightforward with a GScreenOverlay 
image or a custom GControl or a simple div floated over a corner of the 
map.

One problem is that different map imagery suppliers use different 
symbols for the same thing, and even the same image supplier may use 
different symbols in different countries, in different tile releases, 
and at different zoom levels.

For example, the transport icons for things like ferry terminals and 
tram stops look quite different at zoom 16 and 17. Motorway, Autobahn 
and Interstate numbers tend to conform to the national road sign styles, 
so look quite different in different places.

-- 
Mike Williams
http://econym.org.uk/gmap



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