• Grouse Ridge Campground
  • United States

2018 Nav-X Challenge @ Tahoe

Quick Info

  • Date: Sunday, September 9, 2018
  • Location: Grouse Ridge / Tahoe National Forest, Grouse Ridge Campground, Nevada City, CA
  • Event Director: Mats Jansson (contact)
  • Course Director: Andrew Peterson
  • Courses:  3 & 6h Map Trek
  • There will also be 4 standard middle distance orienteering courses offered on Saturday at Broeal by Truckee Orienteering (follow link for more information).

List of Registered Entrants

Follow this link to an updated list of entrants.

Event Summary

The 2018 Nav-X Challenge's fourth event brings us back to the Tahoe area, but this time we will explore some virgin terrain - 100 Lakes.  This beautiful area north of Hwy 80 and West of the Donner summit is the Sierra at its best - fairly open, lots of granite slabs and lakes galore (hence the name 100 Lakes). We will be using an improved Topo map at scale 1:15,000.  While not orienteering level detail, this map will have very accurate contours (from Lidar) and pretty reliable vegetation shadings using the very latest auto-draft technologies from OCAD.  This is a brand new map, folks.  It should be a real treat for anyone who enjoys the high country at the best time of year, whether you are looking for a scenic hike, or an endurance race against some of the best in the west!  Make a weekend of it - participate in a classic orienteering event on Saturday September 8, hosted by Truckee Orienteering.  


Time Long Course - 6h Short Course - 3h
8:00 Event Check-in (and Day of Event Registration)
9:00 Event Check-in (and Day of Event Registration)
9:15 Event Briefing
9:30 Mass Start
10:15 Event Briefing
10:30 Mass Start
13:30 Finish
14:15 3h Awards
15:30 Finish
16:15 6h Awards

New to Map Trekking or Rogaining?

Map Trekking is a “Navigation Sport” that has elements of a few other sports and activities like Trail Running, Fell Running (XC hill running), Hiking, Orienteering and Geo Caching.  More specifically, Map Trekking is a time-based challenge, 2 hrs or more in length, where participants try to score as many points as possible within the time allowed, by visiting checkpoints scattered across a vast, wild landscape.  Participants are free to decide which checkpoints to visit, and in what order.  Typically, a set time is allowed before the start for participants to study the map, and determine their route.  Participants travel on foot and navigate their chosen route using the map and a compass (No GPS allowed except for recording your track).  A late finish comes with point penalties, adding another layer of challenge to the sport.  Checkpoints vary in difficulty and the point value reflects the same, so that easy ones yield a lower point value than difficult ones.  To encourage beginners, course setters typically provide plenty of easy checkpoints near the start and finish location.

Venue / Park Info

The Sierra Nevada mountains of California are world famous for their beauty and wildness. However, almost all of the upper elevations is federally designated Wilderness and therefore forbidden for organized group events or races. 100 Lakes is one of the rare, permittable regions around 7000 feet and we are excited to bring you the 2018 NAV-X Challenge #4 at this beautiful venue! The race area has mostly low/moderate undergrowth and steepness, by California standards, and there are close to a hundred small lakes in the basin.  The mapped area supports a map trek up to about 8+ hrs, so we will not need to do loops this time.  The West part of the mapped area has some reddish rock areas, more broken up, while the rest is typical Sierra granite slabs scattered throughout.  There are a few trails, though much of the advanced control points will require long stretches of cross country travel.  It will be possible for beginners to string together loops that will make significant use of trails.  Due to the few access points to the area, we will have a remote start/finish - plan for a 20 minute downhill walk to the Start, and then again back up after finishing (same place as the Start).

About the Map

This is a new map, suitable for map trekking.  It is considered an "improved Topo" map.  However, compared to most such maps, this one will have very accurate contour lines, owing to available Lidar data.  In addition, using the latest auto-draft technology in OCAD, vegetation shadings will be more accurate than normal for Topo.  The map will be printed in 1:15,000 scale.

Courses & Divisions

There will be two courses offered:

  • 3 hr Map Trek
  • 6 hr Map Trek

Participants can compete in the following divisions:

  • Junior (19 & Under, 1-5 person teams)
  • Open Female (20-49, 1-5 person teams, All-female)
  • Open Male (20-49, 1-5 person teams, All-male)
  • Open Mixed (20-49, 2-5 person teams, mixed Male-Female)
  • Masters Female (50 and up, 1-5 person teams, All-female)
  • Masters Male or Mixed (50 and up, 1-5 person teams, All-male)
  • Masters Mixed (50 and up, 2-5 person teams, mixed Male-Female)
  • Family - Adults (20+) + children (12 & under)

Results from this event count toward the 2018 Series Championship.


Early fees (25% off) through Aug 26th (via online registration).  Regular fee is Aug 27th - Sept 5th (via online registration).  Day of Event Registration is cash only.

Discounts for orienteering club members (BAOC/GCO/etc...), $4 for adults and $2 for juniors.  Discount applied during online registration process.

For family teams (2-hr course only), it is required to have at least one adult (20 & over) and at least one child (12 & under).  Children 12 & under race free.  Children must be registered and accompanied by an adult.

Additional fees to rent an e-punch ($5) and/or compass ($2).  Only one e-punch number or rental request is required per team.  On the registration page, please enter "0" for e-punch number if you are not the first person registering for your team.

Early Registration Regular Registration Day of Event Registration
Course Length 3h 6h 3h 6h 3h 6h
Junior (19 & Under) $15 $25 $17 $28 $20 $33
Adult (20+) $30 $49 $34 $55 $40 $65


Refund policy: 100% refund up to 10 days before event. Future race credit 1-9 days before event. No refunds for no-show.


Wear what you would normally wear for a strenuous hike in Northern California.  Here are some tips:

  • Sturdy shoes with a good tread
  • Long pants or gaiters
  • Visor hat
  • Compass (you may rent one for $2)
  • ePunch (SI stick with 50 control capacity - you may rent one for $5 if you don’t have one)
  • Pen and maybe a highlighter marker (for marking up your map and making notes)
  • Water (enough for the time you will be out on the course)
  • On the go snacks (energy bar, gel, etc.)



From Truckee/Reno, take Hwy 80 West for about 24 miles. Exit 161 take Hwy 20 West 3.9 miles. Turn right on Bowman Lake Rd and follow it 6.3 miles. Turn right on Grouse Ridge Rd and follow it 5 miles to the Campground. Grouse Ridge Rd is a dirt road that is pretty rocky in some spots, but 4WD or high clearance is not required - passenger cars OK. From Sacramento, take Hwy 80 East to Yuba Gap. Exit 161 take Hwy 20 West 3.9 miles. Turn right on Bowman Lake Rd and follow it 6.3 miles. Turn right on Grouse Ridge Rd and follow it 5 miles to the Campground. Grouse Ridge Rd is a dirt road that is pretty rocky in some spots, but 4WD or high clearance is not required - passenger cars OK.