How
to do a Mercator Sailing calculation
The
Text in Blue is the sum
The
Text in Torquoise is the tips
|
Latitude
left
Latitude arrived .
D' Lat
X 60 .
D' lat . |
Meridional
parts
Meridional parts .
D.M.P. .
You
get this in NORRIES Nautical Tables |
Longitude
left
Longitude arrived .
D' Long
X 60 .
D' long . |
D'
lat
= Difference in Latitude
Change all whole degrees into minutes by multiplying it by 60 |
D.M.P.
=
Difference in Meridional parts |
D'
long
= Difference in Longitude
Change all whole degrees into minutes by
multiplying it by 60 |
| |
Latitude
left .....035 degrees N
Latitude arrived 024 degrees S
This means you are going South
|
Longitude
left ....035 degrees W
Longitude arrived 024 degrees E
This means you are going East |
| |
Watch
where you steam from to your destination
If going from North of the Equator to South of the Equator then
you are steaming South.
If going from East of the Merdian Line to the West side of the
Meridian line, then you are steaming West
|
| |
|
Course
=
Tan
Course
= D' long = shift tan =
D.M.P. |
This
gives the course to steam
D' lat course (amount of degrees) D' long course
PUT THE ANSWER INTO YOUR CALCULATORS MEMORY BANK
|
| |
Answer
= D' lat degrees d' long
|
For
D' lat degrees d' long (find N or S for D' lat) the amount of
degrees (find if E or W for D' long)
E.g.
South 036 degrees West = 216 degrees |
| |
Distance
= d' lat
.................Course Cos = |
The
answer to this piece of the sum will give you the distance you
have covered in miles |
