Special care must be taken to ensure an exact register of colours. On a map printed in several colours the course planner must have the opportunity to check the register via superimposed crosses in the different colours. The maximum acceptable error is 0.2 mm.

Legibility depends on the correct choice of colours. The following recommendations are intended to standardize maps as much as possible. The alternative colour given can be used in preference to the recommended colours, since the ultimate choice of colour also depends on the structure of the terrain. The recommendations are given in the PMS system (Pantone Matching System).