[VHFcontesting] Calculating distances from grid squares

[Barry Hansen]

The file from the 'no.nonsense.ee' website that is particularly useful
for maidenhead math is:

http://no.nonsense.ee/qthmap/index.js 

 

This javascript file has a number of utility functions, among other
things, for grid conversions and distance calculations. I found it a good
example of doing the necessary low-level math. This helped me write
functions in PHP for server-side processing and display rover locations
in Washington state and the Pacific Northwest, e.g.
http://www.k7bwh.com/cn87.htm 

 

Hope this helps,

Barry Hansen K7BWH
PNWVHFS <http://www.pnwvhfs.org/>  Webmaster

 

-----Original Message-----
From: VHFcontesting [mailto:vhfcontesting-bounces at contesting.com] On
Behalf Of Jon Pearl - W4ABC
Sent: Friday, April 15, 2016 12:41 PM
To: David Pruett <k8cc at comcast.net>; vhfcontesting at contesting.com
Subject: Re: [VHFcontesting] Calculating distances from grid squares

 

I've found this site to be of great value, too: 

 <http://no.nonsense.ee/qth/map.html> http://no.nonsense.ee/qth/map.html

 

73,

Jon Pearl - W4ABC

 <http://www.w4abc.com> www.w4abc.com

 

On 4/15/2016 1:42 AM, David Pruett wrote:

> The note from KK6MC is a good overview about how distances between two 

> grid squares can be calculated.  Once the distance is calculated, all 

> that is needed is a little more math to apply the ARRL's proposed 

> scoring rules to calculate the QSO point value.

> 

> People should not worry about how accurate their calculation is, or 

> whether they make the calculation at all.  I am a volunteer log 

> checker for the ARRL (ARRL 10M Contest) and all logs are fully scored 

> by the logcheckers and there are no penalties if the claimed score in 

> the log doesn't agree.

> 

> Of course, most people like to see their claimed score before they 

> send in the log (to know approximately where they finished in regards 

> to other stations and existing records).  My point here is that if 

> your claimed score is off by a few percent due to differences in the 

> distance algorithm you use vs. what the ARRL will use, there will be 

> no negative impact.

> 

> 73, Dave, K8CC

> 

> 

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