Re: Maps! (let's have a seperate thread, instead of using roll call)

Old Maps - Valuable historic documents.
BUT - Roads, forests, built-up areas, quarries, railways, danger areas
etc change over time.

They do.

Magnetic deviation not only changes over time, but the rate of change
also changes. Eg., a 30 year old map may give the deviation at the time
the map was prepared, together with a rate of change (say, deviation
decreases by 30' in 4 years). If you calculate the current deviation
using this old info you WILL GET IT WRONG.

In the context of Scouting any leader who uses 30 year old magnetic
deviation info for navigation is a fool and should not hold an
authorisation for the activity.

You cannot navigate successfully without knowing the current deviation
for the sheet you are using .

Correct, but you dont need to actually own the current sheet or have on
in your possesion to know that info, do you ?

National Parks - there is NO general right of access, and never has
been. You CAN use public rights of way, and you CAN use public access
land WITHIN THE TERMS of the access agreement. Some areas of access
land have restrictions on dates or types of access in order to protect
wildlife, private shooting rights etc.

As has been mentioned elsewhere, in most national parks this is a non
issue.

Danger Areas - if you take your Scouts into an active Danger Area
because you use out of date maps, then I sincerely hope the Scout
Association hangs you out to dry. ALWAYS check on the most recent OS
sheet, and also RING THE MOD NUMBER for the area to check current
firing times and restrictions. The local police for the area will be
able to give you the number.

The chances of accidently wandering into a danger area should be zero,
they do make them rather obvious.

And since the OS are introducing rolling changes to their maps, i.e as
changes are made the latest printing gets the changes, the only way to
ensure you always have the latest map in future is to buy one each time
you go out.

I would not suggest people should navigate the hills using pre-OS maps,
but to suggest that leaders should only ever use the very latest
version of a map is daft and wasteful.

.

Relevant Pages

  • Re: Maps! (lets have a seperate thread, instead of using roll call)
    ... a 30 year old map may give the deviation at the time ... but you dont need to actually own the current sheet or have on ... groups (including Scouting groups) on Dartmoor using the red flags as ...
    (uk.rec.scouting)
  • Re: Maps! (lets have a seperate thread, instead of using roll call)
    ... To calculate the current deviation, you DO need a sheet that is no more ... I dont need the very latest map in my possesion to know what the ...
    (uk.rec.scouting)
  • Re: Maps! (lets have a seperate thread, instead of using roll call)
    ... To calculate the current deviation, you DO need a sheet that is no more ... I dont need the very latest map in my possesion to know what the ...
    (uk.rec.scouting)
  • Re: ? not enough eqns
    ... Suppose x belongs to R^n and b belongs to R^m, and f maps x to b. ... When f is a linear map and m < n, we have a unique approximate of ... unweighted) absolute deviation measure, or by using a minimax absolute ... But what about the case when f is a nonlinear map? ...
    (sci.math)
  • A Huge Conditional Format Challenge....
    ... Sheet! ... Map there is approx 20,000 cells that make up the matrix of this particular Vineyard. ... so you can see the anxiety of having to set the CF for each Cell as it would take a very long time to set the 20K cells. ... I was hoping that someone could come up with a looping code that would set the Conditional Format Formula and set the individual color format then step through all the others, all the while incrementing through and correctly pointing the corresponding counter cell. ...
    (microsoft.public.excel.programming)