A previous article briefly alluded to how I was taught the neat trick of estimating map mileage with a compass lanyard. What is a lanyard? A lanyard is just a fancy way of saying the string that comes with the compass. 🙂
I learned this little trick through the Narragansett chapter of the Appalachian Mountain Club during a three-part map and compass class.
What I learned over those sessions still is with me to this day: Looking at contours, reading the terrain, adjusting for declination and other nuts-and-bolts portions of navigation.
And among those lessons was the neat little trick I just mentioned.
So how exactly do you use a lanyard to measure distance on a map?
Let’s pretend the red line below is actually the string from a lanyard:
My fingers would be at either end of the red string. I use a string because it is malleable and can get the nooks and crannies of the trail at least in part.
Now I carefully take that string between my fingers and measure it against the mileage scale found on most maps.
In my example above, I measure a little over 2 miles or so one way.
Now, add a 10% fudge factor to make up for the inexact trace…
That trace comes out to just over 5 miles R/T. Which, no surprise, is also what a popular on-line trail guide states too! 🙂
There are three obvious caveats with this tip:
- Depending on the amount of bends on the measured trail and your finger dexterity with the string, you may need to take multiple measurements. Simply take note of the individual measurement and then continue.
- On a similar note, you may need to move the string along the mileage scale to get the total measurements.
- This tip is absolutely dependent on not letting go of either end of the string with your fingers during each individual measurement.
Don’t have lanyard on your compass? Any thin string will work. Even a shoelace in a pinch.
I do not use this tip as much anymore. Much easier to trace my intended route out with mapping software.
In the field this tip is still used on occasion, however.
Useful for figuring out an approximate mileage of how far I have to travel to a given point.
And a good tool to keep in the backpacking bag o’ tricks.