Thanks, Rassilon7. I've done that; where I'm stuck is: how do I look up that specific POI to find it again? If I already know where it is, I can look for it. But in a big city, do I have to drill down to a relatively close-up level and scour the whole area? Or is there a look-up function?

Similarly, other than poking each little purple square, how do I know I have the correct POI if many are displayed? Actually, I guess I've already answered that: I've made a special Category of POIs for the ones I create, and I can uncheck all the other categories.