Basic Terrestrial Navigation part 3
welcome to Marine Courses Center today we will complete Introduction to Navigation & Navigation Meaning & Navigation Definition
- Basic Terrestrial Navigation part 1
- Basic Terrestrial Navigation part 2
- Ships’ Manning | catering department | seamanship | part 5
- Ships’ Manning | deck officer | Maritime Deck department | seamanship | part 3
1.5.4 Difference of latitude (d.lat.) IN BASIC TERRESTRIAL NAVIGATION :
The rule for finding d.lat. can thus be summarized as follows:
· Same names subtract
· Opposite names add.
In northern hemisphere:
Ø D.lat. will be named SOUTH (S) if the ship is moving from a greater latitude (N) to a smaller latitude (N).
Ø D.lat. will be named NORTH (N) if the ship is moving from a smaller latitude (N) to a greater latitude (N).
In southern hemisphere:
Ø D.lat. will be named NORTH (N) if the ship is moving from a greater latitude (S) to a smaller latitude (S).
Ø D.lat. will be named SOUTH (S) if the ship is moving from a smaller latitude (S) to a greater latitude (S).
Ø If both latitudes have opposite names, d.lat. will have the same sign as the arrival latitude.
1.5.5 Difference of longitude (d.long.) IN BASIC TERETRIAL NAVIGATION:
In Eastern hemisphere:
Ø D.long. will be named EAST (E) if the ship is moving from a smaller meridian (E) to a greater meridian (E).
Ø D.long. will be named WEST (W) if the ship is moving from a greater meridian (E) to a smaller meridian (E).
In Western hemisphere:
Ø D.long. will be named EAST (E) if the ship is moving from a greater meridian (W) to a smaller meridian (W).
Ø D.long. will be named WEST (W) if the ship is moving from a smaller meridian (W) to a greater meridian (W).
Remarks: A slight complication may appear if the sum of the two longitudes is greater than 180°, in this case the d.long. will be 360° minus the sum of the two longitudes. Consequently, the sign of d.long. will be changed.
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