7 Navigation Theory Flashcards
The Earth rotates in a(n) _________ direction when looking onto the N.Pole
Anti-Clockwise
Latitude lines are ________ to the EQUATOR
PARALLEL
Longitude lines are ________ to the EQUATOR
PERPENDICULAR
The EQUATOR is a line of L___tude
LATITUDE
The Greenwich MERIDIAN is a line of L___tude
LONGITUDE
Lat and Long is denoted in ___es, _____s and ______s
DEGREES
MINUTES
SECONDS
What is a GREAT CIRCLE?
- A circle on the surface of a sphere who’s plane passes through the centre of the Earth.
- The shortest distance between two points on the surface of a sphere.
The Equator is a GREAT CIRCLE
What is a SMALL CIRCLE?
- A circle on the surface of a sphere who’s plane DOES NOT pass through the centre of the Earth.
- All circles (other than GREAT CIRCLES) are small circles.
MERIDIANS are aligned /
MERIDIAN - N/S
PARALLELS OF LATITUDE are aligned /
PARALLELS OF LATITUDE - E/W
What is a RHUMB LINE?
A line on the Earths surface that crosses MERIDANS at a constant angle.
Describe CONVERGENCE
As MERIDIANS move away from the EQUATOR they are no longer parallel and distance between them will reduce.
Lines of L___tude are ONLY parallel at the EQUATOR
LONGITUDE
1 nm is equivalent to _.__ statute miles, or _.__ km
1 nm = 1.15 statute miles
1 nm = 1.85 km
Measuring angles on the Earth is done with the ________ system
SEXAGESIMAL system
List the units of measurement in the SEXAGESIMAL system
DEGREES
MINUTES
SECONDS
A CIRCLE is divided into ___ degrees.
1 circle = 360 degrees
A degree is divided into __ minutes.
1 deg = 60 minutes
A minute is divided into __ seconds.
1 min = 60 seconds
1 nm equates to approx. _ minute of latitude
1 minute
60 nm equates to approx. _ degree(s) of latitude
1 degree
Nautical miles are an ANGULAR/DISTANCE measurement? (Choose one)
ANGULAR
Taken from the centre of the earth.
1 nm on the surface of the Earth equals 1 nm for an aircraft or a satellite in space.
Name the 3 standard units for speed.
kt - Knots
mph - Miles per hour
kph - Kilometres per hour
What are the advantages of using True North over Magnetic?
- Does not change with time
- Basis of most maps and charts