Go to GeoDirectory > Settings > General tab > General sub-tab > Show Advanced and add your Google APi keys, and set the Maps API to use OpenStreetMaps. 
Add the following PHP code (we recommend using the Code Snippets plugin)
/**
* Load Google map on admin backend add or edit listing page.
*/
function gd_snippet_admin_add_listing_map_name( $map ) {
global $post, $pagenow;
if( ( 'edit.php' === $pagenow || 'post.php' === $pagenow || 'post-new.php' == $pagenow ) && ! empty( $post->post_type ) && geodir_is_gd_post_type( $post->post_type ) ) {
$map = 'google'; // google or osm
}
return $map;
}
add_filter( 'geodir_map_name', 'gd_snippet_admin_add_listing_map_name', 20, 1 );
/**
* Load Google map on frontend add or edit listing page.
*/
function gd_snippet_map_name( $map ) {
if ( geodir_is_page( 'add-listing' ) ) {
$map = 'google'; // google or osm
}
return $map;
}
add_filter( 'geodir_map_name', 'gd_snippet_map_name', 20, 1 );