5 Tips for Navigating in Low Visibility
1. Use Every Tool at Your Disposal
We’ve all heard the expression “don’t bring a knife to a gunfight.” To that pearl of wisdom, we’d add “why bring one gun when you can have three?”
The three key pieces of kit we recommend you bring along when you suspect you’ll be hiking in poor visibility (and even when not) are a GPS device, an altimeter, and the trusty, tried-and-tested combo of a map and compass.
Not only will this mean you have a backup should any one of your navigational tools fail, but also allows you to cross-check readings from each system to ensure accuracy when you need it most. Make sure none get left at home.
2. Prep Your GPS Device
With any item of hiking kit, if you’re going to carry it, you may as well be sure to make the most of it and have it earn its place in your pack. A good starting point is to make sure you know how to use it.
This is never truer than in the case of a GPS device. While an un-prepped GPS device will definitely still have value by providing you with grid references and identifying your position in the terrain, a few very simple pre-trip modifications can help you get a lot more out of your device and both speed up and simplify navigation in low visibility.
These modifications include loading the most accurate and detailed maps onto your device, adding several waypoints on your trip (as many as one per 500 or 600 feet in trickier terrain*), marking hazards you wish to avoid, locating shelters, and establishing “bailout” routes that you can take if conditions get too gnarly to continue.
*By entering only a starting and finishing location as waypoints, you risk your device offering a “as-the-crow-flies,” direct line of travel to your destination that may take you over several hazards and far from safe, established, and easier-going trails.
If your depth perception is next to nil, turn to another body part to get your bearing.
Pacing is probably the most underrated hiking skill there is. “Pacing” involves measuring how many steps it takes you to walk certain distances on varying angles of slope.
For example, in a local park, wood, or on a day hike we can measure out how many steps we take to reach 100 meters on flat terrain, gentle slopes, and steeper slopes. By keeping a record of our counts, we can then use these in the field in low visibility as follows:
We are on a ridge in low visibility and know we must make a right turn to avoid a hazard or straying off course on a fork or deviation three hundred meters ahead of where we stand. If we know that it takes us 130 steps to travel 100 meters on this angle of slope, then we can count off 390 steps to reach our trig point before making the necessary deviation.
Contouring—traveling along a steady elevation using the contour lines on your map—is one of the simplest and safest ways to navigate in poor visibility and can be used when other features that assist navigation (trees rocks, ridges, boulder fields, streams) are entirely lacking.
Using a map (or GPS device), you can identify a safe, hazard-free line or bearing on a slope and then use your altimeter or GPS device to ensure you stay at that elevation until past any hazards above or below.
5. Route Finding – Stay on Course by Connecting the Dots
In good visibility, most of us typically identify landmarks in the distance to which we wish to navigate—saddles, peaks, passes, etc., especially when hiking off-trail and deprived of a clear path to guide the way. In low visibility, we can do precisely the same, only using nearer and much smaller terrain features such as rocks, hillocks, knolls, or snow patches as little as 50 feet away.
By doing so, we break our route down into manageable chunks, essentially creating a series of “dots” that we can connect to navigate towards our destination without fear of straying off-course. This method also gives us small, achievable goals that can boost morale and lets us stay focused on the terrain in front of us instead of paying too much attention to our map or GPS device and potentially blundering into (or over) a hazard hidden in the fog or mist.
Navigation in white out conditions or heavy fog doesn’t need to be an issue if you stay calm and use some of the advanced techniques above to get your bearings. However, if at any point you feel very unsafe then hunker down, keep warm and contact the emergency services. It is also a good idea to have left the exact trail route plan you expect to take with a person at home who can raise the alarm if you don’t return home on time.
We hope you enjoyed our article and if you have any other tips or advice please share them in the comments.