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Mine came with one, but I promptly used the maps supplied on VeloMaps instead. They're based on OSM data, but have been rendered in a more cycling-friendly manner. I.e. they show small roads and cycleways as well as main roads at the lower zoom levels, as well as cycling-relevant POIs. They're free, and worth investigating.
You can buy additional maps for the garmin such as City navigator europe and for the UK ordnance survey maps but these are at 1:50,000 scale and pixellate at higher zoom levels.
The city navigator series fully support post code search but lack the detail of openstreetmap.