Practical Navigator Part 1 - FUNDAMENTALS

Why is marine navigation is a blend of Science and Art?

Marine navigation is Science because it collects data and involves technical method and calculating position. It is also an art because it relies on experience making wise decision and it anticipates arising danger.

What are the three things that a good navigator constantly think?

1. Strategically - long-term voyage planning

2. Operationally - managing daily ship resources

3. Tactically - handling immediate dangers

A good navigator anticipates ____ situations well before they _____, and always stay “_____”

dangerous, arise, “ahead of the vessel”

What are the 5 core navigation principles?

1. No single method works everywhere

2. Never rely on one system

3. Electronics can always fail unexpectedly

4. Traditional, old-school skills remain essential

5. Navigator acts as system manager

What are the 6 types of navigation?

1. Dead Reckoning & Estimated Position

2. Piloting

3. Celestial Navigation

4. Radio Navigation

5. Radar Navigation

6. Satellite Navigation

What is dead reckoning navigation?

It uses the last known position to advance a position using the course and speed. It ignores external factors like wind and water current.

What is Estimated Position Navigation?

This corrects the dead reckoning through adjusting the leeway, current effects, and steering errors. This is more realistic position than DR alone when condition are rough

What is Piloting?

Involves navigating in restricted water wherein determination of position is constant through the use of geographic and hydrographic features.

Celestial Navigation

• Positioning via stars and sextant

• Reduces measurements of celestial bodies to line of position

• Uses calculators, computer programs, almanacs, or spherical trigonometry

Radio

Fixing position using radio waves through a variety of electronic devices

Radar

Determining distance or bearing from known objects (distinct from its use in collision avoidance)

Satellite Navigation

• Using space signals for positioning

• Functions as an automated, highly efficient electronic process

• Tempts mariners to rely solely on it, despite the constant risk of system failure

What are the four phases of navigation

Inland waterway phase, Harbor Approach phase, Coastal Phase, Ocean Phase

What is inland waterway phase? give me examples

• Piloting in narrow canals, channels, rivers, and estuaries. 

• Panama Canal, Suez Canal, Yangtze River, Mississippi River

What is Harbor/Harbor Approach Phase? give me examples

• Navigating to harbor entrances through bays, sounds, and approach channels. 

• Port of Shanghai, Port of Singapore, Port of Rotterdam

What is Coastal Phase? give me examples

• Navigating within 50 miles of shore or within the 200-meter depth contour. 

• Malacca Strait, English Channel/Dover Strait, Strait of Hormuz, Strait of Gibraltar

What is Ocean Phase? give me examples

• Navigating out in the open sea, completely outside coastal areas. 

• Trans-Pacific Route, North Atlantic Route, Indian Ocean Route

The starting line for measuring longitude, mathematically defined as 0° longitude. This also divides the Earth vertically into the Eastern and Western Hemispheres.

Prime Meridian

What country does prime meridian first sets?

Greenwich, London (often called the Greenwich Meridian)

What is the other pair of prime meridian which is at the opposite side of the globe (180 degree meridian)?

Anti-meridian/ International Date Line (IDL)

Graphic representation of the Earth in digital or graphic form which interests the marine navigator

Charts