Several students of DeVry Institute of Technology in Calgary, Alberta, Canada did just that with
four GPS receivers, a computer, and some specialized software. Four inch accuracy. **No kidding.**
I don't know if they had DGPS units for the experiment. The experiment snowballed from an earlier
experiement that won them some sort of international championship in 2001 when they got an
automated, computer guided model helicopter to lift off, fly 3 meters and hover over a four inch
target, hook onto it and then fly back and land. No manual control what-so-ever. Pretty neat if
you ask me! (But I heard they had to drive at only a walking pace).

"Jack Dale" wrote:
How many out there are prepared to drive their car using GPS only?