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Some day if I can get enough time on the Great Lakes and coast logged,
would
like to sit for the exams.  No better time to start studying than now.



The following is not for anyone on site who suffers from ADD. Tedious,
very tedious.

To find out what professional requirements are needed before a test can
be sat for and the required subjects needed for any level of deck or
engineering license check here:
CFR 46 Subchapter Bravo Sections 10.201 thru 10.1000

On all CG exam questions in the coastal and celestial navigation
sections, of all levels, the CG uses the following formulae to make the
questions and derive the answers they do. This is not cheating in any
way. If one can understand the formulae and how to use them one will
derive the exact "most correct" answer to any of their navigation test
questions.

1. Deriving the Rhumbline course, dr or ep position:
Dr Lat = Lf + or - e((S/60)cos T)
Dr Lon = Lonf + or - e((s/60(sin T/cos Lf))

LF = latitude at last fix or dr pos
Lonf = longitude at last fix or dr pos
e = interval of time from time of last fix/dr to time of latest dr
+ e after fix/dr
- e before fix/dr

2. Deriving set + drift, CMG, CTS, SMG:
A3 = CMG/SMG line's and the vector of set + drift line's angle
A2 = set + drift line's and the vector of the CTS speed line's angle
A1 = CMG/SMG line's and the vector of the CTS/speed line's angle

A3 = CMG* - Set*
A2 = 180*-(A3* + A1*)
A1 = sin -1((sin A3)distance of CMG line/speed)
CTS = CMG* + A1*
CMG = CTS* - A1*
SMG = ((sin A2)s/(sin A1))

3. Deriving LMT Twi, MR, SR and SS:
LMT = ((180 + or - t)/15) +t SS; -t SR; +d = dec SN; -d = dec CN

NTwi: t = cos-1((sin -12 -(sinL x sind)/(cosl x cosd))
CTWi: t = cos-1((sin -6 -(sinL x sind)/(cosL x cosd))
SR + SS: t = cos-1(sin -0.84 -(sinL x sind)/(cosL x cosd))
Moonrise: t = cos-1(((sin(-0.57 - SD + HP) - (sinL x sind)/(cosL x
cosd))

4. Deriving Lat at Lan:
Intercept method
S south of obs: a away, add intercept value to calculated dr to find Lat
                A toward, subtract intercept value from calculated dr to
find Lat

S north of obs: a away, subtract intercept value from calc dr to find
Lat
                a toward, add intercept value to calc dr to find lat

+ d = dec CN
- d = dec SN

Hc = sin-1(cos(dr Lat + or - d))


There are more but this is enough for anyone to chew on for a time.
Good luck in your studies!

   

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