I've recently downloaded school zones POIs and did a test run through town but no alerts came up on my Garmin C510, I noticed that the POI symbols were not on the road but in the school grounds, I then moved a couple of them to the road and bingo the alerts sounded, am I missing something here or do the alerts only work when the POI is on the road?
I have hundreds loaded and most of them are not on the road.