I think this article is poorly titled for the following reasons:
The title National Grid could also refer to a country's electric power distribution system, not maps, I would have thought.
The word map should be in the title.
Mapping co-ordinate systems is a travel topic that is general to the world. Having an article specific to one country may mean information common to all mapping reference systems is duplicated or lost.
Map references or Geographic co-ordinates may be better titles. Perhaps even Geospatial mapping systems or even simply Maps may be more informative and less obscure.
I agree, something needs to change about this to make it more generally useful. Majnoona 12:23, 11 Jun 2004 (EDT)
As far as Huttite's points 1&2 are concerned, I fully agree. In fact I had the same realisation just after I saved it, and was/am still pondering a new title. As you probably realise, this is still work in progress and unlinked from anywhere other than my user page.
As far as making it more general, I'm not sure. My motivation for creating the article was twofold; firstly I felt that travellers to the UK would likely come across uk grid references and may not understand them; secondly I felt the need to include grid references in some UK articles (especially where dealing with out-of-city attractions) and I wanted an article to link to to explain these.
Whilst the principles of a grid reference system are the same, the actual implementation details do vary. If I were just to describe the principles, then the result would be of no great practical use to the traveller, and would in any case duplicate a perfectly good article on wikipedia (WikiPedia:Grid_Reference). If I were to try and cover the detail of each system, then I would end up with something very cumbersome. And of course the co-ordinate system that is perhaps most used (lat/long) is based on different principles, adding more complexity to such an article.
Other than in Britain and Ireland, I'm not sure how widely used grid reference systems are. Certainly as a traveller myself I've not noticed them, but I don't know whether that is because they don't exist, or because they are less generally used, or because I've been unobservant. Do you know of other countries with widely used grid systems?.
Perhaps a solution would be to have a general article on co-ordinate systems (with a practical 'for travellers' viewpoint, rather than a technical one that IMHO belongs on WikiPedia) linking to specific articles for specific systems (eg. LatLong/UK grid/Irish grid/etc).