cm sailing- lesson 1 for moodle (2).pptx

8/15/2019 CM Sailing- Lesson 1 for Moodle (2).pptx

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SAILING- MODULE 1Capt. Nowshad Jobair


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AIM

Familiarization and working with Rhumb LineSailing and Great Circle Sailing


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OBJECTIVES

You will be able to Calculate d.lat! d.long! departure!

course and distance using parallel!plane and "ercator sailing methods.

State the principles o# GC Sailing.

Calculate GC distance and $nitialcourse.


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SAILING

%arallel Sailing Sailing along a parallel o# Latitude. Course to be due East &'(') *+ or due West

&,-') *+ Causes change in D’long but no change in

D’lat Departre is istance along a parallel o#

Latitude! !easre" #n NM

ep / 0Long 1 Cos Lat


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21ample 3 %arallel Sailing &Ch , %g ,+

A ship leaves position Lat. 37º 28′ N

Long. 47º 28′ E and steers 090º T at 12 knotsor 8 ho!rs. "ind the position rea#hed.

SAILING


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eparture %osition Lat. 4-5 ,6′ N Long. 7-5 ,6′ 2

istance / Speed 1 *ime / 9, 1 6 / (: miles

eparture! istance in NM

0Lat / Nil as course is 2;S*

0long / /

/ 9,'.(</ ,5 '9′.' 2

SAILING


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$nitial Lat 4-5 ,6=.' N Long. 7-5 ,6′.' 2 0Lat ' 0Long ,5 '9′.' 2

Final Lat 4-5 ,6=.' N Long. 7(5 ,(′.' 2

SAILING


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21ample 3 %arallel Sailing &Ch , %g ,+

"ind the #o!rse and distan#e ro$

Lat. %3º 42′ N Long. 178º 27′ &

to Lat. %3º 42′ N Long. 179º %3′ E.

SAILING


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$nitial Lat

;rr. Lat


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?essel proceeding along same latitude in >esterl@direction! hence course is ,-') &*+

istance / ep / 0long 1 Cos Lat

/ 9''′.' 1 Cos


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%lane Sailing &Ch , page 7+

Sin Co / Cos Co / *an Co /

epurture / 0long 1 Cos "ean Lat

;lwa@s drawcourse #romNAS Line . 0 L

a t

ep

SAILING


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21ample 3 %lane Sailing &Ch , pg 7+"ind #o!rse and distan#e ro$

Lat. 27º 28= N Long 47º 02= &

to Lat. 24º %3= N Long. 49º 1'= &.

;lwa@s drawcourse #romNAS Line

. 0 L

a

t

ep

SAILING


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From Lat ,-5 ,6=.' N Long 7-5 ',=.' >

Lat,75 0Lat ,5 4

1 :' 1 :' .

1++.& S 1/0.& W

B 0lat / 95 9-=.< S

"ean Lat / $nitial Lat B 0lat/ ,-5 ,6=.' N 95 9-=.< S

/ $2 1&.+ N

SAILING


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ep / 0Long 1 Cos "ean Lat

/ 947=.' 1 Cos ,:5 9'=.< / 9,'=.4

*an Course / epA 0Lat / 9,'=.4A 9


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21ample 3 "ercator Sailing &Ch , %g 9,+

"ind () *er#ator +ailing the Tr!e ,o!rse and

distan#e ro$-A in Lat. 38º 41′ N Long. 32º %4′ & to

-/ in Lat. 49º %0′ N Long. %º 14′ &

SAILING


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Lat. "% Long.

465 79=.' N , 7(5

0Lat 995 '(=.' N "% (4


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*an Course / 0Long A "%

/ 9::'=.' A (4


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Rhumb Line Sailing1. arallel +ailing2. lane +ailing

3. *er#ator +ailing

egrees must be conEerted to minutes

Great Circle Sailing>ork with degrees! Not "inutes

SAILING


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%roperties o# a Spherical *riangle

*he shortest distance between two places on theearth0s sur#ace is the Great Circle *rack.

Great circles appear as straight lines on GnomonicCharts. *he plane o# the G.C. passes through the earths

centre.

*he euator is a great circle. Great circles cross the euator at two points 96' o#

longitude apart.

SAILING


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North 2leEated %ole

PB = 90 -

Lat B

P

PA = 90 -

Lat A

D.Long

A

B

Equator

ii


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North 2leEated %ole

PB = 90 +Lat B

PA = 90 -Lat A

P

D.Long

A

B

Equator


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North 2leEated %ole

PB = 90 -

Lat B

P

PA = 90 +

Lat A

D.Long

A

B

Equator

iii


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South 2leEated %ole

PB = 90 -Lat B

P

PA = 90 -Lat A

D.Long

A

B

Equator


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South 2leEated %ole

PB = 90 +Lat B

P

PA = 90 -Lat A

D.Long

A

B

Equator


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South 2leEated %ole

PB = 90 -Lat B

P

PA = 90

+

Lat AD.Long

A

B

Equator


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Choose @our pre#erred 2leEated %ole

9. Sta@ in S;"2 hemisphere.

,. >ork out ('3 or (' Latitudes! depend oneparture and Land#all positions.

4. $# two positions are in di##erent hemisphere!one leg is ('Lat and the other is ('Lat


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Great Circle Sailing &Ch 4 pg -+

"ind the great #ir#le distan#e

ro$ &ellington N A 41º 38´ S 175º 28´ E

to ana$a /07º 24´ N 079º 55´ W

SAILING


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Cal*late D’long 4#rst5

Long ; / 9-


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A 41º 38´ S 175º 28´ E

B 07º 24´ N 079º 55´ WB

Equator

41 38´S175

28

´E

SAILING

7

24´N79 55

´

A

P


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Cos AB 8 (Cos 6 9 Sin 6A 9 Sin 6B)

: (Cos 6A 9 Cos 6B)

Cos ;I / &Cos 9'7) 4-H 1 Sin 76° ,,0 1 Sin (-° ,70 + &Cos 76° ,,0 1 Cos (-° ,70+

/ '.96-'7 3 '.'6


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In#t#al Corse ;< Cos#ne =or!la

*his method is used to obtain the Ealue o# INTE?IO?angles within the Great Circle triangle.

Cos Angle re@#re" 8

Cos Oppos#te s#"e (Cos A"a*ent s#"e 9 Cos A"a*ent s#"e)

S#n A"a*ent s#"e 9 S#n A"a*ent s#"e

Kr eEen simpler Cos Angle 8 Cos Opp (Cos A"s)

S#n A"s


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*here#ore to obtain the $nitial Course we reuire;ngle ;

Cos ; / Cos %I 3 & Cos %; 1 Cos ;I+

&Sin %; 1 Sin ;I+


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SAILING

>e haEe

PA 8 76 ,,0PB 8 (- ,70 AB 8 9'


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SAILING

To 4#n" In#t#al *orse5

Cos ; / Cos %I 3 & Cos %; 1 Cos ;I+ &Sin %; 1 Sin ;I+

Cos ; / Cos (-,70 3 & Cos 76,,0 1 Cos 9'


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SAILING

To Na!e In#t#al *orse5

In#t#al Corse 8 S 3+.3E

8 13& 3+.3

8 ,0.$ (T)

F r o m t h e > o r k i n g D e m i s p h e r e

. i r e c t i o n o #

. 0 L o n g


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SAILING

$nitial course b@ ;IC "ethod

;/ *an Lat ; / *an 79546=.' / '.,4969 S *an 0long *an 9'754-=.'

Named opposite to latitude ; e1cept when 0long &%+ is

between ('5 and ,-'5

I/ *an Lat I / *an -5,7=.' / '.947,, N Sin 0long Sin 9'754-=.'

;lwa@s named same as Lat I

C / &; A I+ / '.'(-


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SAILING

*an Course / 9 / 94.-'((, &C 1 Cos Lat ;+

Course / S 6


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?EVIEW

You are now able to Calculate d.lat! d.long! departure!

course and distance using parallel!plane and "ercator sailing methods.

State the principles o# GC Sailing.

Calculate GC distance and $nitialCourse.


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2N

cm sailing- lesson 1 for moodle (2).pptx

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