On 7/3/2013 5:36 PM, Joe Subich, W4TV wrote:
Not only that - the centroid of a zip code can be in a completely
different grid than a large portion of the population. You'll
get close with the zip code but it will not be 100% reliable.
Differences can be FAR greater than that. I'm chasing the CQ Field
award -- a Field is the first two letters of the grid. For MANY DX
listings, the default grid will be the geographic center of the COUNTRY,
which for large countries (for example, Australia, Russia, Brazil) can
be 1,000 miles from the actual QTH.
The good news is that qrz.com listings will tell you the source of the
grid info -- DXCC, geocoded, or user supplied. It's also possible to
take an address, or the name of a city/town, and get close. There are
also several websites that convert lat/lon coordinates to grids.
73, Jim K9YC
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