ocean nav

Question 1

mercator sailing DR

Answer 1

calculate d’lat
calculate lat b
find difference in meridional parts
calculate d’long
find long b

Question 2

mercator sailing course + distance

Answer 2

find dmp
find d’long
find course
use course to get d’lat
find distance

Question 3

great circle

Answer 3

distance:
-d’long
-distance
initial course:
-calc a
-calc b
-calc c
-find initial course (tan azimuth)
find gc vertexes:
-vertex latitudes
-vertex d’long
-vertex long

Question 4

speed and eta

Answer 4

find UT by using LiT/15
distance/speed =time
days hours minutes
apply to departure time
apply standard time difference

Question 5

plane sailing

Answer 5

-find d’lat
-find d’long
-calculate departure
-calculate course
-calculate distance

Question 6

intercept

Answer 6

-UT
-chronometer time
-LHA (use SHA for stars)
-declination
-sin alt formula
SA+IE-DIP= apparant altitude
additional corrections= calculated altitude
difference between altitudes=intercept
TRUE TALLER TOWARDS

Question 7

azimuth

Answer 7

-UT
-chronometer time
-LHA
-Declination
-find A
-find B
-find C
-tan azimuth formula
-turn to true

Question 8

plotting

Answer 8

short run, extended, meridional

Question 9

LHA

Answer 9

GHA+ increments +longitude