HE380 - Water transportation. Waterways
HE561-971 - Shipping
HE730-943 - Merchant marine. Ocean shipping. Coastwise shipping
VK - Navigation. Merchant marine
VK321-369 - Harbors. Ports
VK381-397 - Signaling
VK549-572 - Science of navigation
VK573-587 - Nautical instruments
VK588-597 - Marine hydrography. Hydrographic surveying