We were 3 miles from the truck. Save for the umbrella of stars that hung like diamonds in the clear sky, the night was pitch black. Along with our food, extra clothing and other provisions, my son Trevor and I had a couple hundred pounds of mule deer to pack out over snowy, desolate country.
This was in November, and we were in eastern Montana's badlands. Trevor had felled a good buck just as daylight ended, and we had spent two hours after his shot echoed through that vast, publicly owned land skinning and quartering the animal and strapping it into his pack.
Now we plotted a course over and through the endless ravines, gullies, canyons and hoodoos that separated us from the higher country where we had left the truck that morning.
Leading the way, and holding his cellphone in one hand, Trevor watched as a tiny dot on the device's screen showed our ever-so-slowly changing position on a topographic map. Inching our way through the darkness, following the map's contour lines, we knew which steep inclines and drop-offs to avoid.
In flatter country, we could have followed a straight line to the truck. Now, especially with the weight of our packs, it was critical we avoided as many craggy ups and downs as possible.
Turns out, years ago, Eric Siegfried was in a similar position. An eastern Montana native, Siegfried was familiar with that region's relatively flat sagebrush landscape.
But when he graduated with a mechanical engineering degree from Montana State University in Bozeman and moved west to Missoula, he had difficulty locating public land boundaries on his handheld GPS while roaming the region's backcountry for elk and deer.
In response, Siegfried developed in 2007 the onX Hunt chip, which could be loaded into the GPS units hunters commonly carried. The chip allowed off-grid travelers to determine not only their positions on the landscape, but where they were relative to important land ownership boundaries.