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SUMNER LINES
SUMNER LINES
ScnMaster
lines
drawn on a navigational
chart
using a systemized method of finding a
ship
's
position
by means of a
sight
. Named after
Captain
Thomas
H. Sumner who discovered the method in 1837.
—
PDC
2 Approved Glossary
SUMNER LINES
ScnTUEU
lines
plotted
on a
chart
by a
ship
's
navigator
in
order
to
determine
the
ship
's
position
at
sea
when no land is within
sight
. This
type
of
navigation
was
developed
in 1837 by
American
ship
captain
Thomas
H. Sumner (1807- 1876). Using this method, three
points
are
plotted
on the
chart
using calculations based on how long and in which direction the
ship
has traveled, along with at least one sighting of a
star
or other heavenly
body
. With the
use
of these three
points
,
lines
can be drawn showing the direction and
position
of the
ship
.
lines
drawn on a navigational
chart
using a systemized method of finding a
ship
's
position
by means of a
sight
. Named after
Captain
Thomas
H. Sumner who discovered the method in 1837.