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There is no requirement that Skills Challenge fields have the same set of consistent modifications as the Head-to-Head fields. For example, there is no requirement that all Skills Challenge fields are elevated to the same height as Head-to-Head fields. However, all Skills Challenge fields at a single event must use the same type of field control and field perimeter, as described in rules <T22> and <T23>. It is strongly recommended / preferred that all Skills Challenge fields are consistent with each other, but this may not be possible in extreme circumstances. In order to use non-conforming Head-to-Head fields for Skills Challenge runs (e.g., during lunch), the following steps should be taken: Teams must be informed that the Head-to-Head Fields may have some differences from the Skills Challenge Fields (e.g., they might not have the GPS strips) Teams must be given an option to select which type of Field they want to use, i.e. they cannot be required to use the Head-to-Head Field for any Skills Challenge run