Display a separate, full listing of all markers associated with the map.
Shortcode Example
[wpgmza_marker_listing id="1"]
Shortcode Attributes
| id (number) | The Map ID you would like to show |
| style_idĀ (number) | The Style ID for the marker listing |
| style_slugĀ (string) | The Style Name for the marker listing, alternative to ID |
