Placemark ID's

You can find valid placemark IDs by going to the Placemarks screen (e.g., https://example.com/wp-admin/edit.php?post_type=bgmp) and hovering your mouse over the title of each placemark. The URL of the edit screen for that post will show up in the status window at the bottom, and it will include the ID of the placemark, e.g., https://example.com/wp-admin/post.php?post=1265&action=edit, where 1265 is the ID.