Cool - I have this picture ion my mind - hundreds of dollars of
sophisticated electronics - hundreds of hours of late night development time
(hundreds of gallons of coffee)  then----

First test - the mower "brains" resets when it shouldn't mower turns left
and shreds the stationary GPS.

Make sure to send to Americas funniest home videos...

Sorry
But I had to...
Syd


-----Original Message-----
From: Reginald Neale <neale@SERVTECH.COM>
To: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
Date: Wednesday, November 19, 1997 11:14 AM
Subject: [OT] GPS/Lawnmowers


>>if two gps receivers are used one stationary an one on the mower the
mower's
>>position can be calculated to within 1cm.  you read both receiver at the
>>same time an calculate the difference then apply this to the fixed and
known
>>location of the stationary receiver.
>>
>
>Two identical receivers, even if they are close to each other, do not
>necessarily lock on to exactly the same set of birds. AFAIK, to get
>positions down to the cm level you need a special differential receiver to
>transmit corrections to the "ordinary" receiver.
>
>For anyone who is interested, there is a newsgroup: sci.geo.satellite-nav
>
>Reg Neale