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To give a good spread of course lengths, the following lengths are recommended. As always, you might tend towards the longer end on flat, easy terrain, the shorter end if there is much climb.
White 1.0-2.0 km
Yellow 2.0-3.0 km
Orange 2.5-3.5 km
Light Green 3.0-4.5 km
Short Blue 4.5-6.0 km
The numbers give the minimum map order. It's always worth a conversation with the entries coordinator before you commit on numbers. Up to 50% of entries come in the last week, after you've ordered maps.
White (20, allowing an extra 3 maps for Taster runs)
Yellow (20, allowing an extra 3 maps for Taster runs)
Orange (30)
Light Green (45)
Short Blue (65)
All-controls maps (for SI team, planner, hangers, collectors, and controller) (10 - fewer if you home print individual maps for hangers and collectors)
Maps without courses (for last-minute notices in Start box) (3). Note that these should include any purple OOB areas or purple lines for uncrossable fences / walls.