How can I delete all user waypoints from my iPhone? I have the BGA waypoint database installed but don't want to see all the waypoints when I fly aeroplanes not gliders.

Ideally I would be able to turn them on & off as a map layer?

But more urgently, I can't find any functionality to delete user waypoints, let alone 'delete all'. I have already tried deleting them all on the PC, doing a 'save to cloud' and then a 'load from cloud' on the iPhone, but no luck.