@nminchin’s code self.custom.marker = event just assigns the event value to a property where you can see what is in the event that you have available in the runAction script. You don’t actually want to assign the event to the marker. In other words; delete that line from your action.
For navigation line, see system.perspective.navigate - Ignition User Manual 8.1 - Ignition Documentation. To work as written, the marker’s name needs to be an exact match to the page URL you have setup for the view. See Pages in Perspective - Ignition User Manual 8.1 - Ignition Documentation. If you haven’t setup a page URL for the view, you won’t be able to navigate to it.