Two sections near the end were added;
one on Augmentation systems, and one on Global Navigation Systems. General updating: I
have updated the text in quite a few places, such as eliminating the word “recently” which is
no longer really recently. Also the Conclusion has been appropriately reworded. Added one
reference [25
].
Living Reviews applied its current layout to this revision.
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| Corrected sign of the last term. | |
| Sentence added. | |
| Added reference to
Figure 4 |
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| WGS-84 (837) changed to WGS-84 (873). | |
| Section added. | |
| Section added. |
| http://www.livingreviews.org/lrr-2003-1 | This work is licensed under a Creative Commons License. Problems/comments to |