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Places of Ancestor Events that do not appear as pins on the map are probably missing the correct GPS longitude and/or longitude. Determining which Places are missing and need correction can be resolved easily with custom filters... but it takes multiple stages.
The objective is to find the Places of Events of Ancestors of the [[Gramps_Glossary#home_person|Home Person]]. That's Which is 4 stages of filtering.
You can set up a [[Example_filters|multi-stage of filter]] that shows only Places for Ancestors & [[Gramps_{{Version manual}}_Wiki_Manual_-_Categories#.E2.9A.99_Configuration_Options|configure the Places Category view]] to show the Longitude & Latitude columns. This will tell you how many of Ancestor related Places will be omitted from being plotted on the map.
