23 Grid Navigation Flashcards

1
Q

Describe a Standard Grided Chart

A
  • A Polar Stereographic chart with the grid aligned with the Prime Meridian
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2
Q

What is Grid Convergence?

A
  • Grid Convergence is the difference between True North and Grid North
  • Grid Convergence is zero at the reference meridian
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3
Q

How can you calculate Grid Convergence?

A
  • Grid convergence value is equal to the change in longitude (degrees) between the datum meridian and the point
  • Since Constant of the Cone = 1
  • Direction: if true north is east of grid north than GC is east and vis-versa for west
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4
Q

What is the phrase regarding Grid Convergence and East and West?

A
  • Grid Convergence East, True Least

- Grid Convergence West, True Best

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5
Q

What is the formula for Grivation?

A

Grivation = Grid Convergence + Variation

  • East is +
  • West is -
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6
Q

What is a line of constant Grivation called?

A

Isogriv

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