Lamberts chart, Polar steriographic chart (31-05-18) Flashcards Preview

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Flashcards in Lamberts chart, Polar steriographic chart (31-05-18) Deck (19)
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1

What is the relationship between the angle of cone and the parallel of tangency of a lamberts chart?

it is a sin relationship

2

When is chart convergency equal to earth convergency on a lemberts chart?

At the point of tangency

3

How is the chart coverage of a lamberts chart extended?

The scale at the point of tangency is mathematically reduced, creating two points where scale is correct called standard parallels.

The new reduced point of tangency is called the point of origin

4

What are the 2 rules for keeping a lamberts chart within 1% of accuracy?

the 1/6 rule 

in between standard parallels is 4/6 of the chart, therefore either side of the standard parallels is 1/6 of the chart.

16degree rule

the maximum difference in latitude between the standard parallels is 16deg.

5

What is the max chart coverage of a lamberts chart?

24deg chlat

6

When is a G.C on a lamberts chart straightest?

When closest to the PoO

7

How will G.C curve in relation to the PoO on a lamberts chart?

They will always curve concave to the PoO

8

How will R.L curve on a lamberts chart?

They will always be concave to the closest pole.

9

How are G.C represented on a lamberts chart?

Straight lines

10

What is the chart convergency on a lamberts chart?

cc = Chlong x sin(PoO)

11

What is sin(PoO) otherwise known as?

n

chart convergence factor (C.C.F)

Constant of Cone

12

When plotting on a lamberts chart, what track would you use?

the track at the midpoint of the G.C (R.L track)

13

What is the fisherman’s hook?

The arrow above a NAVAID that allows you to plot directly in mag on a chart.

14

What kind of projection does a polar stereographic chart use?

azimuthal/plane projection

15

What is the PoT of a polar stereographic chart?

A pole

16

At what rate does the scale expand from the PoT on a polar stereographic chart?

SECANT2 x 1/2 co-lat

(co-lat is chlat from pole to latitude of interest)

17

What is the convergency of the longitudes on a polar stereographic chart?

it is equal to Chlong

18

What is the accuracy of the polar stereographic chart considered to be within?

1%

19

When are G.Cs considered to be straight on a polar stereographic chart?

Above 70deg lat.