I spent several hours trying to find out why I started getting longitude number 
that were way off. Everything seemed to be working properly,  but the tbolt was 
reporting longitude numbers way off from the surveyed position.  

I thought that my attempts to feed it an accurate lunch had gotten the unit 
into some bogo-state.  Did a power cycle and factory reset and new self survey. 
 Still got bogo-longitude.  Curse you John Harrison!

Turns out I had the wrong tbolt connected...  the surveyed point in the front 
yard has a very close latitude to the rooftop antenna,  but off by around 70 
feet in longitude.   All them serial cables look alike.  D'oh!

----------------------
An equally creative solution -- just move the antenna a
few feet in whatever direction you need equal the value
of the single precision number ;-) I can see your deck
now - with an old CNC XYZ head and a GPS antenna...


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