Possibly. Not every member of the team needs to be a navigator, but you need at least one (preferably some back up navigators too). Navigation is the biggest determinant of how fast you will be able to get through the course. You can be a double Iron Man champion, but If you can’t use a map and compass, expect to lose to a slow team of experienced orienteers.
We highly recommend attending orienteering meets (or adventure races) before the race, if you will be navigating. Most areas have
a nearby orienteering group. Here in northern New England, we have UNO
There are also many books available on map and compass use. A recently published book, specific to AR, Squiggly
, is a great resource.