Bingo Control

From Orienteering Wiki

noun, is a control placed on a feature that is hard to locate, perhaps because it is isolated, because it is one of many similar in a small area or because the map is deficient around the control.

An example might be a small pit in a fairly dense piece of forest, where you can be within metres of the control and still not see it.

Bingo controls are unfair because you may waste a lot of time having navigated quickly and as accurately as possible to the the vicinity of the control, yet you still have to hunt randomly to find it. Other people may find the control almost straight away having navigated no more or less accurately. Even worse a rival competitor may arrive just as you find or leave the control thereby finding it immediately - Bingo!

A good planner will be able to spot and avoid potential bingo controls, whereas a poor planner may deliberately use them, thinking that a control which is hard to find is a Good Thing.