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GPS has a resolution of about 50' (even with WAAS). Precision systems will usually set up 2+ transponders at known locations (known to the inch), and the guidance system will work off those. Most of the discussion in this DIYDrones thread doesn't appear to realize the limitations of GPS - or even care about them. (And I understand why - DIYDrones are mostly interested in mapping and navigating.) When you have large equipment in a field, you need *precise* control; nearly to the inch if you're planting/cultivating row crops.
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Hey Louis... Sorry to hear about your weather station project. All I can say is look at their reasons and try again - a lot of projects don't get funding on the first attempt! BTW: Our SARE grant calls for some consultants/experts. When is the next time you'll be in the area?
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These should be relatively easy to implement using FidoNet type (or similar) technology.
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Any idea why things got a lot "busier" in October? Also, there is a precipitous drop in December - I think; could this be the result of a DDOS attack? (I've had problems accessing the site from time to time over the past two weeks.)