What type of orienteering involves a series of checkpoints that must be visited in order?

The correct answer pertains to a specific type of orienteering that emphasizes following a defined path between a set number of checkpoints. In this type of orienteering, participants are required to navigate from one checkpoint to the next in a predetermined order. This structure necessitates not only map-reading skills and an understanding of terrain but also an ability to plan and maintain the correct sequence throughout the course.

The nature of this format contrasts with other types of orienteering. Cross-country typically involves a more open style where participants can choose their own routes between checkpoints without a specified order. Relay orienteering focuses on teamwork, where teams take turns navigating, usually to various checkpoints in a relay format, without the emphasis on visiting checkpoints in a strict order. Line orienteering may refer to navigating along a set path or line, but does not necessarily imply that the checkpoints are visited in sequence.

Given the requirements of the question, the option selected correctly identifies the type of orienteering characterized by a strict order of checkpoints, which is crucial for understanding this concept in the context of orienteering events.