Save maps gps into separate meta fields

Currently it’s not possible.

I’d suggest you create a new field which inherits from map, but save LAT and LNG into 2 more fields. I wrote a documetation for creating a custom field, please take a look.

To do what you want, I think all you need is just add save method, like this:

function save( $new, $old, $post_id, $field )
{
    parent::save( $new, $old, $post_id, $field );

    list( $lat, $lng, $zoom ) = explode( ',', $new . ',' );
    add_post_meta( $post_id, $field['id'] . '_lat', $lat );
    add_post_meta( $post_id, $field['id'] . '_lng', $lng );
}

It will save LAT, LNG in 2 custom fields: $field['id'] . '_lat' and $field['id'] . '_lng'.

Thank you very much. It’s great.