GPS accuracy is so good that it's tempting to rely on it exclusively. That could be a mistake in abnomal traffic conditions.

Visit NAP.edu/10766 to get more information about this book, to buy it in print, or to download it as a free PDF. The presence of SA has little or no effect on the ability to use GPS for orbit ...

Improved integrity, availability, and resistance to RF interference are as important to many land transportation GPS users as defeating the accuracy degradation caused by SA. GPS-based automobile ...