Each field in the grid is a map reference, starting from the top left corner with map reference 1,1. For example, Daba is located in map reference 5,4. Use map references when giving orders.
A little confusing as land maps in the U.K all have grid references that start in the bottom left, and go along, then up. As opposed to sea charts, which start in the same place, but go up, then along! But I dare say that I'll get used to it!