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Grid Square to Grid Square Distances

Jul 19th, 01:31

NZ3O

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
On the Contest Rules, it talks about a public "standard algorithm" for calculating the distance between two 6-character Grid Squares, but I do not find that anywhere on the site.

Has the ARRL published the Grid Square distance calculation?

73, Byron
Jul 19th, 07:20

W1VT

Super Moderator

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
http://www.w1ghz.org/

http://www.w1ghz.org/new/bd_2004.zip

http://www.arrl.org/grid-squares
Jul 19th, 11:37

NZ3O

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
Thank you. The QST Article is helpful for understanding how to map Grid Squares to Longitude and Latitude and vice-versa, but the BD_2004 code requires a lot of interpretation.

Is there no specification of how to calculate the distance? I do understand we cannot just do a straight line between two points.

I appreciate your support.
Jul 19th, 17:13

NZ3O

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
This has the precise code I needed. Seems accurate. I am now designing the Grid Square conversion to add to it.

Thank you. 73, Byron

https://www.plumislandmedia.net/mysql/stored-function-haversine-distance-computation/

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