IBCAO began by building on the database established during the compilation of the General Bathymetric Chart of the Oceans (GEBCO) Sheet 5.17, a bathymetric contour map of the Arctic Ocean above 64[degrees] N (Canadian Hydrographic Service, 1979) (Fig.
A traditional bathymetric contour map provides a crude view of the seafloor shape.
Everyone has the standard book of numbers, but when you really start looking at a chart with good bottom lines and bathymetric contours
, you'll find that there's a pattern to your numbers--say a structure that the fish are gathering around that you didn't even know was there.
measured with a portable sonar instrument from a boat identify local areas with relatively thick accumulations of sediment as well as areas which are being scoured by waves.
* Digitized bathymetric contours
, coastlines, and trackline control from the GEBCO Fifth Edition published at a scale of 1:10 million