In ArcGIS Pro I am making maps in the UK and am using British National Grid. In my layout view for the maps I have the grid lines turned on, however these grid lines are slightly skewed and do not run at right angles to each other. All my layers as well as my map space are British National Grid. I imagine this is something to do with the CS being used. Does anyone know how to make these run at right angles to each other.

I have attached an example of the maps made.

enter image description here

  • It most definitely has to do with the coordinate references used. Please Edit the question to specify what those are (data and map canvas).
    – Vince
    Jun 29, 2021 at 12:29
  • Hi VInce, thanks for your comment. All my layers and map space are in British National Grid. Is there anything else I should check. Apologies if it is a silly question. Thanks.
    – Robbie-G95
    Jun 29, 2021 at 13:42

1 Answer 1


Fixed by changing the map from magnetic north to map north.

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