HP 15CE Aviation Pac

[Thomas Klemm]

(08-24-2024 07:23 PM)Geoff Quickfall Wrote:  On the 41C I would put a test in to determine if the longitude of point a was equal to the longitude of point b, therefore due north or south, then a second subroutine to determine if point a longitude was > than point b for direction of flight.

Another to determine if you were traversing through a pole.

This is the huge advantage of using the polar / rectangular functions.
They just work without handling special cases.

Examples

Over the north pole:

A: (60, 0)
B: (30, 180)

5400.000

To the south:

A: (60, 0)
B: (30, 0)

1800.180

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Quote:east and south co-ordinates are entered as negative values.

Just out of curiosity: Is this an American convention or common practice in aviation?