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CBDDADXXXXTFFFT16. Yawing17. Longitudinal18. Minimum

19@20 d!"!#ming i$ to #!du%! magn!ti% &i!ld

21222'2(. D2). *

Deep Water :+outing $,i"$ in d!!" wat!# and at $low $"!!d.

T,! magn!ti% &i!ld g!n!#at!d - a %u##!nt %a##ing wi#! om %on%!nt#i% %i#%l!$

a#ound t,! wi#!. T,! di#!%tion o& t,! magn!ti% &i!ld o& t,! loo"$ i$ d!t!#min!d - t,!right hand grip rule.

Underwater acousticsi$ t,! $tud o& t,! "#o"agation o& $ound in t,! wat!# and t,!int!#a%tion o& t,! m!%,ani%al wa/!$ t,at %on$titut! $ound wit, t,! wat!# and it$-ounda#i!$.

Signature - T,! !n!#g !mitting and #!&l!%t in %,a#a%t!#i$ti%$ o& an o-!%t - w,i%,%an -! u$!d &o# d!t!%tion %la$$i&i%ation and ta#g!ting.

*$!i

1a. Material SPMs

+3 o# minimum magn!ti% $t#u%tu#!4,o%5 mount!d ma%,in!# !ui"m!ntDnami% o# adu$ta-l! d!gau$$ingoi$! #!du%ing "#o"!ll!#$Continuou$ &low ma%,in!# "lant

Magn!ti% ,gi!n! log$A%ou$ti% gi!n! and monito#ingMinimi$! lu:u#; dom!$ti% &itting$

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Damag! and?o# !m!#g!n% "oli%i!$ All #ound $!a#%,!$ w,!n "#o$!%uting and "#io# to MDC &i#ing

2a. Degaussing

M!t,od and t!%,niu!$ o& #!du%ing a $,i";$ magn!ti% &i!ld in$tall!d in t,! /!#ti%al &o#! and a&t "lan! to %om"!n$at! &o#at,wa#t$,i" %om"on!nt$ o& magn!ti$m. .

&. 'ow ship agnetic (ield e((ected b) the earth agnetic (ield.

Common !l!m!nt$ u$!d in $,i" %on$t#u%tion and $$t!m$ $u%, a$ i#on andallo$ ,a/! natu#al magn!ti% "#o"!#ti!$ and -!%om! "!#mam!ntl magn!ti$!d

du#ing %on$t#u%tion and #!&it$ und!# t,! in&lu!n%! o& t,! !a#t,$ magn!ti% &i!ld.n !&&!%t a $,i" %an -! %on$id!#!d a$ a %oll!%tion o& magn!t$ !a%, o& w,i%,%ont#i-ut!$ to t,! $,i"$ total magn!ti% &i!ld.

,il! w! t!#m t,! &i!ld "!#mam!nt all t,i$ m!an$ i$ t,at t,! mat!#ial will t!ndto #!tain it$ magn!ti% "#o"!#ti!$ w,!n t,! magn!ti$ing &o#%! i$ /a#i!d o# #!mo/!d.But t,! %,a#a%t!#i$ti%$ o& a $,i"$ "!#mam!nt magn!ti% &i!ld %an /a#. T,! !&&!%t$ o&$,o%5 $u%, a$ ma%,in!# /i-#ation o# t,! "ounding o& ,!a/ $!a$ %an %au$! t,!magn!ti% domain$ to #!align to #!&l!%t t,! di#!%tion o& t,! !a#t,$ magn!ti% &i!ld att,at "oint and t,u$ t,! "!#mam!nt &i!ld o& a $,i" %an /a# wit, tim!.

ndu%!d magn!ti$m i$ %au$!d - t,! !&&!%t o& t,! !a#t,$ magn!ti% &i!ld onmat!#ial $u%, a$ $o&t i#on w,i%, will -!%om! t!m"o#a#il magn!ti$!d. T,i$ mat!#ial

do!$ not #!tain an magn!ti% &i!ld w,!n t,! magn!ti$ing &o#%! i$ #!mo/!d and t,u$

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t,! indu%!d &i!ld will alwa$ #!&l!%t t,! di#!%tion and int!n$it o& t,! !a#t,$ &i!ld att,! $,i"$ lo%ation a$ w!ll a$ t,! $,i"$ ,!ading.4om! mat!#ial$ ,a/! $!mi "!#mam!nt magn!ti% "#o"!#ti!$ w,i%, m!an$ t,at t,!will -!%om! magn!ti$!d und!# t,! in&lu!n%! o& !:t!#nal magn!ti% &i!ld$ -ut will$lowl lo$! t,at magn!ti$m on%! t,! magn!ti$ing &o#%! i$ #!mo/!d.

T,! !&&!%t on a $,i"$ magn!ti% &i!ld i$ t,at i& t,! $,i" maintain$ t,! $am!%ou#$! &o# $om! tim! t,i$ mat!#ial will -!%om! magn!ti$!d und!# t,! in&lu!n%! o&t,! !a#t,$ &i!ld -ut t,! magn!ti$m will $lowl %,ang! w,!n t,! $,i"$ %ou#$! i$%,ang!d. T,u$ a $,i"$ magn!ti% $ignatu#! will /a# wit, tim! "o$ition and ,!ading.

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