"soxinbox" wrote in message
...
In non aviation GPSs, at least the older ones, there really is a
limitation on speed. [...]

You are right about the older satellites. However, that explanation is
irrelevant for the GPS being discussed here. Also, I don't see why the
limitation you're talking about would manifest itself as an upper bound on
the speed display; it would simply result in no position information at all
above a certain speed.

Pete