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    Re: navigation by soundings.
    From: Hewitt Schlereth
    Date: 2009 Dec 21, 10:25 -0400

    Wonderful story. Great catch, George.  And a Merry Christmas to you. -Hewitt
    
    On 12/21/09, George Huxtable  wrote:
    > I will copy below a short extract from a piece that took my fancy in the
    >  recent edition of The Journal of Navigation (vol 63 No1, January 2010), in
    >  case it appeals to other navlist members.
    >  It explains itself pretty well. Lowestoft is the most Easterly port on the
    >  North Sea coast of England. An "armed lead", has a tallow or lard smeared
    >  into a dimple under the lead so that it picks up a sample of the bottom.
    >
    >  George.
    >
    >  contact George Huxtable, at  george@hux.me.uk
    >  or at +44 1865 820222 (from UK, 01865 820222)
    >  or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    >
    >  ==============================
    >
    >  Heaving The Lead
    >
    >  Lt Cdr R W Cooper RN
    >
    >  2. BOYHOOD BACKGROUND. My experience of the practice of heaving the lead and
    >  navigation goes back to 1937. My father was a North Sea fishing skipper and
    >  I was the eight year old son who was obsessed with navigation. My bedtime
    >  reading was Tait's Home Trade Guide, and I knew the Colregs, Morse code and
    >  flag meanings off by heart. That year I was allowed for the first time to go
    >  on a trawling trip with my father.
    >
    >  Navigation at that time consisted almost entirely of sounding by armed lead.
    >  The ship would be stopped and the 16-pound lead cast. The depth was noted,
    >  and the state of bottom examined closely, and tasted by the skipper and
    >  mate. I tasted it too. It was foul. This was done several times at hourly
    >  intervals until suddenly, and for no good reason that I could discern, the
    >  trawl was shot with the traditional order " Shoot the nets in the name of
    >  the
    >  Lord. "
    >
    >  Soundings were taken at half-hourly intervals while trawling. And then after
    >  hauling, the whole ritual was repeated. We had been trawling on a NNW
    >  course, and before shooting again, we had moved some six miles to the
    >  westward. This procedure was repeated several times until my father decided
    >  to return to the home port of Lowestoft. No attempt had been made to fix the
    >  position during the 72 hours. It seems that the bottom of the North Sea has
    >  a fan-shaped pattern of low ridges which do not appear on navigational
    >  charts. It is in the valleys between these ridges that the best flat-fish
    >  are found. It is the fan-shaped nature of the ridges that make them ideal
    >  for navigation, for the distance between the ridges gives the latitude
    >  accurately enough.
    >
    >  As the trawl was hove in on the derrick out at sea, my father himself cast
    >  the lead, tasted it, and then ordered something like west-south-west and a
    >  half west and off we steamed. The lead was cast at hourly intervals without
    >  stopping the ship. It was swung overhead three times before being slipped
    >  and only the depth noticed. Perhaps the course would have been corrected by
    >  half a point. Otherwise we went straight at the Holm buoy.
    >
    >  Note that the chart was never consulted. My father's collection of blue-back
    >  charts was kept tightly rolled in black japanned-cases closed with a
    >  padlock. Only he (and I) looked at them. They had originally been his
    >  grandfather's and were never used for navigation. Certain sea areas were
    >  covered with minute marks and symbols entered at the end of each trip by
    >  mapping pen. They represented details of catches and abnormalities of the
    >  seabed.
    >
    >
    >  --
    >  NavList message boards: www.fer3.com/arc
    >  Or post by email to: NavList@fer3.com
    >  To , email NavList+@fer3.com
    
    --
    NavList message boards: www.fer3.com/arc
    Or post by email to: NavList@fer3.com
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