The old receivers were single satellite receivers. The new ones are parallel receivers. In other words, the old ones would receive data from each satellite, one at a time, then run caculations on a processor that was designed by cavemen. The new ones receive data from up to 12 (or more) satellites at once and immediately process it. There is virtually no lag time. An ungrounding can cost thousands of dollars, plus repairs. I'd suggest that they replace the unit.
