For the Coast and Geodetic Survey, Marmer wrote " Tides and Currents in New York Harbor ", " Coastal Currents along the Pacific Coast of the United States ", " Tidal Datum Planes ", and " Chart Datums ".
22.
This indicates that the light is a " group occulting light " in which a group of three eclipses repeat every 10 seconds; the light is white; the light is 15 metres above the chart datum and is visible for.
23.
Tide tables give the height of the tide above a chart datum making it feasible to calculate the depth of water at a given point " and " at a given time by adding the charted depth to the height of the tide.
24.
Admiralty charts include information on : depths ( chart datum ), coastline, buoyage, land and underwater contour lines, seabed composition, hazards, tidal information ( indicated by " tidal diamonds " ), prominent land features, traffic separation schemes radio direction finding ( RDF ) information, lights, and other information to assist in navigation.
25.
The Quay 2005 scheme included reclamation of of land west of the dock entrance, on the banks of the Humber estuary; in the original scheme the reclaimed area was roughly a right trapezoid which projected well over into the Humber, with a south facing front of over; the instrument also allowed dredging of the quay and approaches of up to below chart datum.
