Magnetic Declination (Grade 12 NSC Matric Geography): Flashcards
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Magnetic declination
Magnetic declination
Angle between true north and magnetic north
True North characteristic
True North characteristic
Points to North Pole, remains constant
Magnetic North characteristic
Magnetic North characteristic
Direction compass points, changes over time
Annual Change (AC)
Annual Change (AC)
How much magnetic declination shifts per year
Eastward annual change rule
Eastward annual change rule
Subtract total change from original declination
Westward annual change rule
Westward annual change rule
Add total change to original declination
Step 1 of MD calculation
Step 1 of MD calculation
Calculate years between current year and map year
Converting 0.5° to minutes
Converting 0.5° to minutes
Multiply by 6: 0.5 × 6 = 30'
If minutes exceed 59'
If minutes exceed 59'
Subtract 60 from minutes, add 1 to degrees
Final MD answer format
Final MD answer format
Always express as 'west of true north'