Grid refs do a good job in the UK. Two letters (which can be omitted if you know roughly where you are) and 6 digits get you to a 100m square, 8 digits to 10m a

Grid refs do a good job in the UK. Two letters (which can be omitted if you know roughly where you are) and 6 digits get you to a 100m square, 8 digits to 10m and so on. That's the system the police use as the base truth, and any other system - what3words or Lat/Long - will be converted to OS grid refs with some loss of accuracy due to different projection models. Maps show the grid as an overlay every 1km so the position is easy to read.