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Another aspect to the user of overlays would be to allow the pins to be grouped together (call each group a "layer" if you like). So that I could switch on the pin layer for settlement names separately from the visibility of the geographical region pins.
Writing the above, I just realised you could partially do this with a "filter" based on the type of category for each pin that is linked to a topic. Although it doesn't cover unlinked pins.
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