I average 54 paces over 100 metres, which is 4mm on a 1:25k grid.

So to work out say, my paces over 700 metres I can multiply 54, by 7.00 = 378 paces.

So its easy enough to double this, to write a pace card, for a 1:50k grid, then double that again, for a 1:100k Grid.

But Ive just bought a harvey map, which has a 1:40k grid.

So, I know that 5mm, is 200 Metres on a 1:40k grid, and I know my pacing will be 108 paces.

So to work out my average pace over 6mm, 240 metres, on a 1:40k grid, do I simply multiply 108 by 2.40 = 259.2 divided by 2 = 129.6 paces?

And so on....

7mm, or 280metres. 108x2.80/2= 151.2 paces.

I know to round down paces, and understand naismiths rule, but dont want to get into diferent methods, I just ant to know if that sum is correct?

[I carry a little write in the rain notebook with my pace cards in to glance at if needed.]