There are 4 types of plots:
(1) Coverage (on the left in a series of three, looks 'blotchy'). Each
sounding produces a circle indicating the area covered by the 10
degree cone on the sea bed. Lighter gray shades are shallower.
(2) Interpolated gray-scale (middle in a series of three, looks smooth).
Triangular Voronoi tesselation of sounded points, then interpolation
within triangles. Lighter gray shades
indicate shallower depths.
(3) Contour plots (right in a series of three).
Triangular Voronoi tesselation of sounded points, then interpolation
within triangles. Contours are annotated with depths.
Outline of a boat indicates our guess of the position of the wreck.
The size of the outline is what the ship was when she was sailing.
Bold "*" usually indicate the charted position.
Small "+" symbols indicate depth sounding positions. The two bars (one
horizontal one vertical) are 20m length. The coordinates are in
degrees and decimals (GPS position WGS84 datum), except where indicated
otherwise. Depths are in m, ref LAT.
(4) Previous soundings. Plots done on previous occasions, with
soundings recorded manually. The style varies, so read legend carefully.
(14/10/2007)
(8/1/2006)
(4/12/2005)
(18/12/2005)
(15/12/2007)
(20/10/2007,29/11/2009)
(29/11/2009)
(15/12/2007)
(11/11/2007, 18/11/2007)
(9/11/2008)
(16/12/2006)
(5/10/2007)
(4/5/2008)
This was the state of tide when I dived the Hispania, Thesis and Rondo. All were at slack or had only little current on the wreck.
(6/12/2008)
(24/5/2008)
(25/5/2008)
(28/5/2008)
(23/5/2010)
(6/6/2010)
(Nov/2005) 
(Sep/2005) 
(20/9/2009)
The data shown here should only be understood as exercise in depth sounding / charting / bathymetry and should not be relied upon for activities where safety is critical.
Equipment: Garmin GPSMAP 178C, dual frequency transducer (50/200 KHz), 12V 12Ah lead-acid battery, in Explorer cases 1913 and 4419. This equipment was funded by the University of Edinburgh Development Trust.
Comments welcome to m.ruffert (at) gmx.net
