RadioBanter - View Single Post - What's the most accurate elevation tool on the net (freebie)

[email protected] · March 4th 12, 08:10 PM posted to rec.radio.amateur.antenna

Jeff Liebermann wrote:
On Sat, 3 Mar 2012 18:47:56 -0000, wrote:

GPS 3 meter error

Yep. However, standing under the tower, in order to take advantage of
this level of accuracy is often impractical. Climbing barbed wire
topped chain link fences is not my idea of fun. I ran into the
problem when I was throwing together a map of the local cell sites:
http://802.11junk.com/cellular/ (from about 2002).
I had a suitable GPS, but I couldn't get anywhere near some of the
towers in order to get an accurate position. I had to record a GPS
location nearby, measure or estimate the distance and direction to the
tower, and then do the math.

My objective was to determine my full Maidenhead before there were web
applications to find it.

I just took my portable, WAAS enabled, aviation GPS to the back yard and
let it average for a couple of minutes.

Since then I discovered why I kept getting different results pre-GPS (long
boring story about map accuracies); turns out the dividing line runs
down the sidewalk across the street.