In Greece HERE has better coverage, better street numbering on main roads but very outdated pois and sometimes very strange routing that doesn't make any sense.
So I think TOMTOM is better for big cities like Athens where you need good routing and HERE is better for the country side.
OSM maps are much worse than HERE and TOMTOM so there is no point in using them.
It's so pity that iGO has much worse traffic than other GPS programmes, which makes it a bad choice to use in cities with big traffic.
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