From: teeks99stuff@yahoo.com   
      
   bob  wrote in   
   news:422288a8@news.maxnet.co.nz:   
      
   > Well i have looked at this myself. A passive self tracking vehicle is   
   > a option i like. Now gyros etc all have too much drift unless you buy   
   > military spec. A simple alternative is startrackers, sun/moon trackers   
   > and horizon detectors. (some of these can be combined). at initial   
   > launch you can track the sun on fine days. But the drift on COTS-MEMS   
   > gyros/accelerometers is OK for the short period to "clear" sky   
   > viewing. There are many details I'm leaving out. But if you know the   
   > UTC time, the relative postion on the moon, earth and sun and say even   
   > some planets/stars you can accurately determin your location.   
   >   
   > But you still need to transmit that back to earth..... I haven't   
   > figured out that one yet.   
   >   
   > Greg   
   >   
      
   How accurate is this tracking?  I know its not down to a couple feet like   
   GPS, but is it down to a couple miles?   
      
   Tom   
      
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