yellow map thingy link?

[young Ed]

ok so fairly reccently i beleive someone posted a link in someone elses thread on the forum to an electronic yellow map something or an other and i should have saved it as a favourite but i didnt
so can you lot help me find it?
Cheers Ed

P.S i beleive in the same thread two people posted links to dynamo gharging systems for your bike if that helps?