Archive for January 17th, 2008

January 17th, 2008

Navigating by the shape of snowdrifts

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Report from Svante: Today started as a rather warm day – a comfortable –18˚C. After a while we had to stop and remove one of our layers of thermal underwear, because we were sweating and simply too hot.

The last few days we have gotten used to –30˚C and wind, plus a chill factor due to the wind. Well, there was virtually no wind when we started, just sunny, nice and calm weather. But in the afternoon the cloud cover drifted in, and everything became white, the horizon all the contours disappeared. It’s called whiteout.

Without either sun or wind, it is really easy to lose all sense of direction – and it became a real challenge for me to stay the course. And when you can’t even see the surrounding terrain, it becomes almost impossible. Almost, but not quite …

Under such conditions one has to navigate by the shape of snow drifts on the ground. Today I kept our direction by continually studying two types of snowdrifts. One of these was relatively soft and fresh, deposited the day before yesterday, when the wind was blowing at about 90 degrees relative to our direction. The other type of snowdrift was a bit older, perhaps made a week or so ago, when there was a hard wind from south-southwest.

In this manner I “felt” my way forward, and was able to keep us moving on a fairly straight course. That’s reflected in our distance: 22 km in 8.5 hours. And that is up to par, so we’re very pleased. The position of our camp this evening is. S89˚24’15”, W95˚38’50”.

Like an Easter excursion

Report from Svante: Today started with absolutely fantastic weather. It was minus seven or eight, sunny, and not even a breeze. On days like this, it gets so warm in the tent that you scarcely need a sleeping bag. We started the day with a navigation course after breakfast – and we believe that is well-invested time. We have a number of days of skiing the snow and ice to look forward to.

We walked for seven hours, and during that time each group member was given an opportunity to lead, setting our course in relation to the sun and the shadows we cast on the snow. Elementary geometry tells us that the sun moves about 15 degrees through the sky per hour, so there is no need for GPS.

The magnificent weather made this day feel like an Easter excursion. However, in this white, reflective landscape at 2800 metres altitude, the sunlight is scorching – although it’s easy not to realize that until it is too late. We protected our exposed skin with a factor 50 sun lotion and … to avoid burns. Despite not being in a hurry, we’ve covered 12 km.

It’s been a wonderful day.