The Map facet works with latitude and longitude coordinates. The source type should be a custom field with as value an array containing the coordinates like this:
[ 'lat' => 5.1025, 'lng' => 40.5548 ]
Is it possible to save the data of Google Maps field or OpenStreetMaps field (or any others) as their request? I could use ACF but I prefer Meta Box.
The field Google Maps or Open Street Map saves the data (location) in the following format latitude,longitude,zoom. You can use the function rwmb_get_value() to get only value latitude and longitude for that addon.
.
