Geogrids sample your local search rankings across a grid of points around each business location. In MLAP Settings > Geogrids you choose which geogrid configs count toward MLAP.
Each location lists its geogrid configs, and a location can have several. Enable a config to include its rankings in MLAP's visibility scores, or disable it to exclude it without losing data. Deleting a config removes it and all of its historical MLAP stats.
The included rankings show up on the Location view's Geogrids tab. New to geogrids? See Geogrids: The Basics.