I’ve noticed that in the OSM base layer there are shipping lanes leading to/from major seaports. I’m interested in downloading the data for these shipping lanes via the overpass API.
Here’s an example of the shipping lanes I’m talking about: http://www.openstreetmap.org/#map=15/41.3529/2.1906
http://wiki.openstreetmap.org/wiki/Marine_navigation#Ferry_and_shipping_routes suggests shipping lanes are marked with seamark:type=separation_boundary, seamark:type=separation_zone and seamark:type=separation_lane.
I used the following query to overpass
http://www.overpass-api.de/api/xapi?*[bbox=-180,-90,180,90][seamark:type=separation_lane]
, as well as queries for separation_boundary and separation_zone. However, the data returned does not correspond to the shipping lane data I see in the OSM base layer.
I have also read through much of the information on openseamap.org to no avail. Any guidance would be much appreciated.