1 - NGA

subaqueous rocontmlssanco sunmy—A
hydrugrapfris survey which is a rapklly executed
prelknirmry euvq of a rag’km to pruvti
edvenca information 10- immsdiite military
needs. Nerrnetfy made at arna~ ac@e, kf is
usually rmf confrdled by Iriangulelkxr, and may
be little more than a sketch with onty a few
crifii soundings shown
subaqueous running survey— A
hydrography survey of an nxpbmlcsy nature
afortg an unknown or hostile coast made from
shiird to deharrnins the general form of the
coast and the nsture of the ares.
subrwtral point—Sea subatallsr point.
●ubdlvhkm ●urvay-A type d bnd euway in
Whkh ths bOSl boundsrias of an area are
bcatd arxf i-to area is dwided into parcels ef
bfs, sfrasfs, right-ef-way, and other eccassorias
All necaSaely comem or dividhg lines are
merksd or rnonumented,
siubgravffy-A ccmdifion in whch the resuftant
ambient acceleration is between zero end one
9.
sublunar point—The geographical position of
the Moon. That point of the Eeflh at which the
Moon is in the zenith al a 6wcified time. Sea
also Subaatelllta point.
submarine rsflaf-Vrmiations in elevalion of
the ocasn fbor, or their mpresentatkm by da@h
curves, tints, or soundings.
subordlnata station— 1. One of the places
for wlich tide or tidal currant predictions are
defarminad by a@ying a correction to the
predktions of a reference station. 2. A tide er
tidal currant station at which a shorf ~ria~ of
observations has bean med., whkh are
raducd by cemparfeon with simuttanaous
obaarvatiorrc at a reference station.
subsatellfte point-The point al which a line
from the sstelliia perpandkular to the elfiieoid
intersects the surfeca of the Earih. Sea else
sublunar point.
subaidfery station-A station esfabfiahed to
overcome some bcsl obstacle to the pregrass
of a survey, and ncd to determine position data
for the sfat?on point. The term subsidiary etetion
is usualfy a#ied to A-stations of a traverse
suway. Subeidisry statiena usually are
MIL-HDBK-850
246
ter’rporary in cfwader and nor parmanenfty
msrfwxi ff serving the ackfiiioml purpose of
SU~IS9 COntrd for a Iocaf survey, such station
NY b. Pemsananity marked and ii is hers ●
.s~plementary statbn.
subsolar point-The geogrephid poehbn of
the Sun, Tlwt point on the Earth at which the
Sun is in tha zaniih at a apecifii time. See afao
subatallar point.
●ubatalfar point—llwr geographal fmsition
cd a star. TM point on the Earth at which the
s7sr is In the zsnilh at a specfkt lime. Also
rolled ●ubastrsl point. See also ●ubaolar
point.
subatltuta cantar+l poinl whiih, because of
its ease of idanlifiition on ovarb@ng
photographs, is used insraad of the principal
point as a radial center.
subourfaca float+ hdbw cylindar, with ita
axis held verlicfd, at a constant depth by the
buoyant effect of an indicating surface float:
usad to determine current velodtiss in streams
or chcnnels having a relatively uniform depth.
-. ,..
rtubtenco bsr travorce-A traverse method
in which course Iengrhs ere measured by usc of
a subtenae bar.
aubtanse bar—A horizontally hefd bar of
pracise~ datemrinad length, used to measure
distance-s by observing the angla it subtends at
the distance to be measured.
aubtanao baa. trevare*A trsvame
mathed in which distancea are dat amsined by
precisely measuring, at one end of the course,
the angle subfandad by a precisely measured
baa. at tha other and of the wursa end
approximately normal to if.
subtonse method-A procedure by tiksh
distance rnsasuremsnts are obteinsd by USe of
a subferuw bsr.
aubtractlng tape-A calibrated survayots
tape with ths first foc4 (or meter) at each end
graduated in tenths w hundredths Also called
cut taps. See also adding tape.
Summary of Corrsctlone-A aummsry of
outstanding notices affecting all nautical charts
and publications. This information is also
accessible on the Navigation Information
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