Lines of fixed length

[nicks]

I have an OS plan with the 100 metres squares marked.
I want the ruler to coincide with the known 100m length
Then I can mark on layers various lines of say 7m or 25m long.
How can I set the ruler and guides to enable me to draw lines such as this.

[pauland]

If I understand you correctly, I'd load the map onto a layer and then adjust the scale to fit the ruler, so that 100 on the ruler was the same size as the 100 metre square.

I'd then draw my lines on another layer on top and keep the layer with the map on locked.

[Egg Bramhill]

Welcome to the forums nicks. What scale is your ordinance survey map?

[Egg Bramhill]

I've done a quick video on how to use the scaling option. You can view it HERE.

[nicks]

If I understand you correctly, I'd load the map onto a layer and then adjust the scale to fit the ruler, so that 100 on the ruler was the same size as the 100 metre square.

I'd then draw my lines on another layer on top and keep the layer with the map on locked.

Thanks Pauland
The problem is that I can't set the ruler to fit the 100m square

[nicks]

Welcome to the forums nicks. What scale is your ordinance survey map?

It was a photo of a 2500 drawing but of course the scale changed with the photo and I cant get the ruler to match the 100 metre square

[pauland]

Thanks Pauland
The problem is that I can't set the ruler to fit the 100m square

But you can size the square to fit the ruler. Scale the image aligning one of the squares to the ruler.

[Egg Bramhill]

nicks, it's fairly straight forward. Did you watch my video tutorial?
If you want, email the photo to me HERE and I'll do it for you.

[pauland]

Eggs video is very good. My suggestion will work, but Eggs will put everything into the right units, so you don't have to worry about thinking too much.

[nicks]

Thanks for your help offer Eggs. I'll learn more doing it myself. I couldn't open your video. Was I doing something wrong?