Many would say that there is a consensus that navigation must be included. A let's have a look then at a comparison between many well-known events to give us some perspective. These events all take place in a mountain location, are unsupported. The series is progressive so the first event of the series does not require full equipment to be carried for an overnight camp. The third event however does require full gear and moves continuously over 24 hours.
Navigation is an essential skill.
There is no navigation required, and it is not held in a mountain location. The event is aimed essentially at new entrants to the sport and that's got to be positive. Salomon challenge is held in mountain territory where navigation is essential and multiple activities occur over the continuous 35 hours of the event. The Western Isles challenge takes place in a very exciting mountain and sea environment, and takes place over several days with multiple activities and navigation. This event is probably currently the longest in the UK .