Navteq make the maps for garmin, and many other, satnavs. You can report map errors to them at
http://mapreporter.navteq.com/?app.basemap=jsl and they will correct it. It may take a few months to appear on satnavs as it's a long process but I have reported errors and changes in the past and they were corrected in periods of 6 months to 1 year.
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