Garmin Edge 800 guidance problem

variflex Posts: 42
edited January 2014 in Road general
Evening everyone,
Having managed to get one of the Amazon Garmin deals on the 800 Ive now used it a few times and started plotting and downloading courses. Im using the freeby OSM maps which are pretty good, but despite turning guidance on for each course individually I dont get any prompts unless I go off course. Not sure whether is the map or some other problem. Any ideas?