On Tue, Apr 21, 2015 at 1:30 AM, Pete Stephenson <[email protected]> wrote: > On Tue, Apr 21, 2015 at 4:25 AM, Charles Steinmetz > > Indeed. I'm running a 48-hour survey with Lady Heather now to see if > that can improve things a bit more. >
You can let the GPS receiver do a self-survey but you can also enter the location that you determined by other means. I've not done this on a Thunderbolt but have for my Motorola receivers. Just by chance I needed to get my property surveyed and had a crew out and they marked the property with brass markers positioned to a fraction of an inch. (I hope) From this I can figure out the antenna location to likely about one foot or maybe better if I am really carful. One thing to watch out for is that there are different "systems" of measuring latitude and longitude these make different assumptions about the shape of the Earth and where its center is located and so on. You need to be sure everyone is using WGS84. If not it is easy to be "off" by a couple hundred meters You can use Google Earth if you don't have a survey but check it for accuracy. Have Google check the location of a government benchmark that is nearest your house and see if Google gives you the recorded location. It's good to find the antenna location using other means so you can verify the self-survey.. I did this and found it is all OK within some margin of error. But then I have a very good antenna location. I think with a poor antenna location you'd want to verify the self-survey -- Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
