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Peter Fogg said-

 One problem with closely
>settled places like this is that they may have lots of local roads (indeed
>entire villages with their churches
>hiding outside the place) that are just not shown on the national map that
>has been carefully acquired. Its
>a problem I've also found just on the other side of the Channel. With the
>GPS the local roads and laneways
>can be tackled with some confidence if the bearing and distance to target
>are known, although some tracks
>may turn out to be dead-ends.
>
>Go very carefully down those narrow lanes. The locals have a terrible
>habit of driving far too fast along
>them. And on the wrong side of the road.

He must have met me...

===================

My guess is that Peter must be discussing travel in France. To drive in
France, what's needed is the 1:200,000 Michelin Motoring Atlas, not a
"national map". There aren't many villages or churches missing from that!

Similarly, to drive in Britain what's needed is a 1:250,000 road atlas
(about 4 miles to the inch).

The trouble with many road atlases is in their gridding. In many cases, the
grid markings relate only to each map-page and are unrelated to the
gridding of adjacent map-pages and bear no relation to a national
coordinate system or to latitude or longitude or WGS84. So there's no way
to relate them to coordinates taken from a GPS receiver.

With some receivers, you can select display in National Grid coordinates,
which if it includes Britain would mean OSGB36 (Ordnance Survey of Great
Britain 1936). You can buy a Road Atlas produced by the Ordnance Survey
(it's a bit more expensive than the others, as you might expect) which is
to National Grid, as are some of the Atlases marked "AA" (automobile
association) but not others. I know of none marked with lat and long.

Local map sheets; "Serie Bleu" in France, 1:50,000 series in Britain, do
carry lat and long tick-marks around the edge, but widely spaced, so
they're not very useful.

George.

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