Conclusions and Acknowledgements

It has been argued that the long history of navigational aids has resulted in an inconsistent use of certain terms and that difficulties arise when attempting to build logical structures to contain database information. Adopting a revised system of nomenclature solves the problems raised when attempting to classify navigational aids in a logical system. It is accepted that complete agreement of all interested parties over such a scheme will never be possible, but that the proposed system does at least offer the prospect of consistent data when shared between those who agree to use it.

The author expresses his thanks to Jim Slechta for inspiring him to write this paper. A particular debt of gratitude is owed to Michel Forand for his many constructive suggestions.

© 2003 Ken Trethewey