Thank you very much for the quick reply gynta. I tried a few values and eventually settled for 22. Now if I zoom out as much as possible, exit the app and then open it again the waypoints are there regardless of the zoom level but after my phone goes to sleep the problem reappears. Also, since I changed the value of map_items_points_simplification_till_zoom all of my icons are gone and replaced with default points (although I expected this to happen it is not ideal).