> Although satellite steering is becoming > very popular for planting! > Not sure what the resolution for that is, > but its got to be in the foot range to work well. Then they are combining inertial sensors with GPS. Precision of a GPS reading (number of digits to the right of the decimal point) has very little to do with the accuracy of that reading, something that one learns the first time one uses GPS to dive on a specific wreck or feature. So, 4 Meters "RMS" means 7.8 meters at a 95% Confidence Interval I call it "8", as I only have so much room for trivia that could kill me if I did not memorize it, and only so much tolerance for math as a survival skill. And that's just horizontal accuracy. Vertical is worse, see the spec: http://www.gps.gov/technical/ps/2008-SPS-performance-standard.pdf The only time this issue really mattered to me was when navigating the narrow dredged/blasted channel through the coral on the way from Key West to the Dry Tortugas and back, as a sailboat with a keel is not the best choice of boat for that run. Back then we did NOT have the (civilian) GPS accuracy we have today. But a fondness for both sailboats and diving reefs is a combination that is more likely to end in tears and recriminations than not. If it GPS gets better, I think it will require more than 24 birds in the sky at a time, and receivers that will take longer to acquire more birds. But it has eliminated the problem of forgetting where those hives were placed, and eliminated the old "abandoned" hives problem in forgotten holding yard positions, which used to be more common. *********************************************** The BEE-L mailing list is powered by L-Soft's renowned LISTSERV(R) list management software. For more information, go to: http://www.lsoft.com/LISTSERV-powered.html