I had problems on a 700i that I think were caused by loading the OSM gmapsupp on the main drive rather than an SD card. Sometimes it worked, sometimes it didn't. Updating the firmware and doing a reset made no improvement. I deleted the file in the wrong location and replaced it on an SD card. Still wasn't great, needed to buy/download Garmin's City Navigator and that seemed to fix it. Topoactive would be as good I expect. I get the impression Garmin devices are a bit flaky with free OSM.
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