[Xastir] MGRS/Maidenhead grid squares.

Curt, WE7U archer at eskimo.com
Mon Jan 10 16:14:07 EST 2005


On Sat, 8 Jan 2005, Tapio Sokura wrote:

> I just noticed that the Maidenhead grid calculation in Xastir is
> slightly incorrect. For example when I zoom close to 60N/20E crossing
> the status line says 20E, 59 deg 59.983 min N is already KP00AA, but it
> should be KO09AX right upto 59 deg 59.999 minutes N (the change happens
> between 59.982 and 59.983). This seems to be visible on any south-north
> maidenhead border, the change happens 0.017 minutes too soon (use zoom
> level 1).
>
> East-west direction calculation seems to be ok, the change happens right
> at the degree border.

Does it sound like a rounding problem?  Datum problem?  I'm thinking
the former is likely.

--
Curt, WE7U.   APRS Client Comparisons: http://www.eskimo.com/~archer
"Lotto:    A tax on people who are bad at math." -- unknown
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