What is a bingo control and how do I identify one when course planning and control checking?
A bingo control is one where there is no good attack point within reasonable distance of the control – for example a boulder on a broad hillside. It becomes a "bingo" because competitors are more likely to get to it by good luck rather than good navigation, or because they see another competitor at or near the control.
Course planners most typically make the mistake of setting a bingo control when setting up a contour leg which is probably too long. Remember, if you are course planning, you need to ask yourself just what is the purpose of each leg, and to try and work out the different ways that competitors might take to get to it. Is the control fairly placed, or does it leave too much to chance?
The vegetation around a control site might also increase the likelihood of the control being a "bingo". For example, most of us at some stage have floundered around in tall bracken looking for a hidden feature that is quite strong on the map, but hidden in the terrain. It is the responsibility of the controller and course planner to ensure that the control site is fair.