I want to get the categories from the map and display them on the custom post page. I tried using get_post_custom() to display all custom fields but your custom fields do not show.
e.g. http://trysailing.nevada.ie/club/kinvara-bay-sailing-club/ -> show the counties, disabled sailing etc. relevant to the club page.
You will automatically get the maps categories on a google meta box at customs posts. You don't need to do any coding to achieve this.
When I run this code .....
$meta = get_post_meta( get_the_ID(), '_wpgmp_metabox_taxomomies_terms' );
.... I don't get much, only this
 => s:2:"N;";