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i got really frustrated with the 800 telling me to ride across parks that had no cycling restrictions, and taking long convoluted routes, navigating for car reduced a lot of this
OSM maps ? If so you can fix the problem at source by heading over to http://www.openstreetmap.org, editing the map and putting Bicycles=no tags on the offending ways. Then wait a couple of days and download fresh maps.
i got really frustrated with the 800 telling me to ride across parks that had no cycling restrictions, and taking long convoluted routes, navigating for car reduced a lot of this