For me, it doesn't really make sense to have placemarks showing up in search results on my website.
I've found it very easy to find out how to exclude them - a quick test and things seem to be working so I think I've got it right.
But I wonder if this could be an option in the settings?
(In case anyone is wanting to know how, go to core.php for the plugin, go to where the custom post type is registered, starts at line 482, then in
$postTypeParams = array add
,'exclude_from_search' => true )