[ImNotJohn] I wonder it's still called "orienteering" and hasn't made the jump to "orientationeering" in the twenty five years since I did any.
I miss the old OS maps. I stopped using them about the time they completed the old red-cover One Inch To One Mile series and began redoing the job in pink-cover 1:50 000 metric maps (talk about make-work in government!). They must have done all of the UK in metric by now I would think.
As a teen I salivated over the prospect of a complete collection of OS maps. I think I have six.
I've often wished for the same types of maps with the same degree of coverage in the places I've lived since leaving the UK, but other countries missed that particular boat and are unlikely to go that route now we have "better" GPS systems. It was one of the nastier shocks to find that other western countries didn't have super-accurate maps for the asking. I had to use boat charts and forestry "blueprint" jobs for the most part. Joni Mitchell had it right.

Incidentally, it took me about five attempts to type your screen name without automatically inserting spaces (I tried Im Not John, ImNot John, Im NotJohn, then did some of them again before I got my brain to do it right). I've never had that happen before. Did you design for that effect?

I'm doing the world premiere of "What happened here - a retelling of Lear" tonite, and the second and final-for-us-but-hopefully-not-for-the-author show tomorrow nite. Sunday is a rest day :oD First Sunday without either rehearsal or show since nehwwonktnodi...

[Sierra Mike] I answer to INJ mostly. In fact elsewhere I tend to be just NotJohn - Im not sure why I've got the 'Im' in the Morniverse.
I'm also a bit of a cartophile - I've got 2 shelves devoted to them at the moment. I have a version of the Stevierule^TM which goes 'No Map no Trip'.
OS maps now cover the whole of the UK at 1:25000 and are so much clearer than the 1:50000, which I use mostly for cycling. I still love the 1 inch tourist maps with the colouring & hachuring but you can't beat the large scale for navigating in mist/cloud. Also you get spoilt by the quality of orienteering maps 1:10000 or 1:15000 using specialised software, where you can navigate to the nearest 10 metres.

[S M & INJ] These come in an attractive orange cover, far nicer than the 1:50000s' lurid pink.

I have inherited dozens of OS maps from my cartophilic Dad, mostly 6th Edition but some older than that (pre-war). The expansion of some towns is phenomenal. Crawley, for example, was a compact place with a station and a high street but is now a vast, amorphous sprawl. The new 1:50,000 and 1:25,000 maps are more accurate and detailed than their older counterparts, particularly in regard of contours. There are sad (old meaning) bits such as "Course of old railway" and "Mines (disused)" (Yeah, so's mine). Even though the OS Grid has always been metric I'll never get used to heights in metres. My house is at 557 ft, not 169 metres, so I claim the title of Highest-living Morniverser.
[Non-mappies look away NOW] The OS Grid is a Transverse Mercator projection, prime meridian 2°W, based on a model of the Earth developed by Sir George Airy over 100 years ago. It's a tiny bit different from modern values both in size and degree of flattening. There is a scale reduction of 0.04%, presumably to allow for the expansion of the scale in the projection away from the prime meridian.

[Rosie] I cannot claim such a lofty domicile, but two minutes' drive gently uphill takes me to this point, Cossham Hospital, the highest point in Bristol at 369 feet (112 meters). On a clear day the views over the city, the Severn Valley, Forest of Dean and even the Brecons are excellent. Oh, and thanks for the techie stuff!

[ImNotJohn & Bigsmith] Blimey. We used to use the old red cover jobs when I was doing it, though admitedly I was less than serious about orienteering and probably just ran with an amateur crowd. I had no idea there was a 1:25 000 series of maps available commercially. Do they cover the entire UK? The only 1:50 000 OS map I can reliably put my hand on today would be "Land's End and The Lizard", and I can't for the life of me remember why I bought that one. I used a couple of Welsh ones until they fell apart but Land's End? When did I go there? It has some touristy annotations on it, like scenic photography overlooks and so forth, which my Welsh ones didn't. I suspect it was a detail added halfway through the print run or something.
[Rosie] That's a nice legacy you have. I didn't remember that the 1 Inch to 1 Mile series had a metric grid. I do remember that we were taught to read an OS map in Geography class when I was around 11 or 12. That's when I fell in love with the things.

[Sierra Mike] Have a look here for the answer to your question.

[SM] It's the wonder of satellite technology. Effectively the whole country has been remapped (at least as far as contours are concerned) in a matter of a couple of years whereas before there was a large team of cartographers doing physical surveys. This has got rid of some of the more obvious mistakes that used to exist, although there are still paths shown going over cliff edges in a couple of places that I know.
For orienteering we normally start with a base plot (usually from the OS) with contour intervals down to 2.5 metres where appropriate (5m for very steep ground). There is then a specialised package (OCAD - there were others but this has come out on top) which has all the correct colours and symbols built in and you can build the map from that. There is still a need for fieldwork, but the whole thing is much slicker and maps get changed up to about 2 weeks before an event. Also with cheap high-quality printing most events now have the courses pre-printed - no need to copy from a master, and you can even run off more copies while the event is taking place if you get more than expected on one course. With electronic punching you get a print-out of your final and split times as soon as you finish and results from an event are on the web the same day. Up to about 10 years ago you left an SAE at the event and got the results about 1-2 weeks later.

For mountain walking I like Harvey Maps. They are at 1:40000, often photo-enlarged to 1:25000. They aren't as good in farmland as they don't show field boundaries, but they do show what is actually on the ground - there are different symbols for a right of way which is visible and one which is not visible as well as another for a visible path which is not a r.o.w.. They also change the colour of the contours to show rocky or marshy ground.

This weekend I will continue recovering.
I like maps but do not own many (only one proper map, really), mainly because we don't have much landscape over here. Or perhaps we have far too much of it. In any case, [INJ] I feel remarkably uneasy when I am in an unfamiliar place without a map, and I really need to know where North is. Changing hemispheres is very disturbing. I came very close to mapping our parts of Oman, at least as far as roads and such things go, because they (maps) either did not exist or were wildly inaccurate. But the cost of GPSrs was too high. I now have a nifty little one, and have been enjoying the occasional geocache, thanks to my sister and brother-in-law's introduction. It definitely helps break up long drives, and is a fun way to explore new places. I haven't done orienteering in at least 20 years.

[ImNotJohn] For years I lived in a street that the local "A-Z" type guide showed as having a cross street where there wasn't so much as a kerbstone. When this error survived two reprintings I got clued in. By pure chance I was living next door to a copyright protection scheme. The map publisher had put in a fake street so that they could easily catch competitors who saved the cost of a survey just by copying their maps. I've learned since then that an awful lot of this sort of thing goes on. Dictionaries, thesauri (?) and encyclopediae (??) have fake entries in them to snare copyright infringers. The original pubishers work on the theory that you'd be unlikely to actually read the articles/entries since you can't get to them in any day-to-day use of the dictionary/thesarus/encyclopedia but only by reading through them serially.

I have to admit, sending someone off a cliff seems a bit much though. I hope this gets fixed in GPS sets since judging from recent news items some GPSers are a bit too slavish when it comes to following the directions their boxes give them and I wouldn't be surprised to read of someone stepping out into empty space.

[Bigsmith] Thanks for the map info.

Now nothing will suffice but that I order a 1:25 000 map of Land's end and The Lizard.

I have a couple of 1:25000 maps covering my area of residence. A month or so ago I dug out one of them in order to scan part of it and send the resultant image to a cyber-acquaintance. I doubt that I had referred to this publication within the last three or four years. I also forgot to put it back in stowage that evening. The following afternoon my wife came home and plonked down before me a new copy of the very same map. Having given her a puzzled look she explained that the previous evening she had looked for the 'missing' map and, not finding it, thought it best to buy a new one.

Hmmph. Raining and cool. The sweetpeas need it.

(INJ) It could be a clifftop path that has disappeared due to coastal erosion if you're anywhere near the east coast.

(Bigsmith) So, Fishponds, Bristol, then. I had heard of it, for some reason, probably to do with the railway, which I see has been ripped up.

Hmm, talking of Bristol, I'm going there for the first time shortly - any recommendations for good places to take a 3 year old and 5 month old? We've got the zoo on our (short) list already...

I wasn't clear enough. In both the cases I know of the path exists, but the line has been 'smoothed' to an easy curve and so doesn't avoid the feature whereas, on the ground, there is a deviation to miss it.

[SM] Yes, the false street is indeed a standard copyright protection measure.
[Rosie] You may hold the highest living Morniverser right now, but if so I probably held the title for a couple of years when we had a 10th floor apartment here in Singapore. Now we are back at sea level.