To find out Latitude and Longitude for Google Maps, starting point go to Google Maps, find your location, click right on the location on the map and click “What’s here”. Coordinates will show in the search bar on top.
If you use global header set google maps coordinates as instructed here: http://help.wprentals.org/2015/10/28/global-header-options/
If you use custom header set google maps coordinates as instructed here: http://help.wprentals.org/2015/10/28/custom-header-options/
Some pages will take the lat and long of the first property in list (advanced search results, properties list, owner list (when not using read from file)