I have also use a Silva Ranger Compass both on and off the job for 25 years and they have been great. I have 3 old ones in the house with bubbles but all as a result of physical damage. I carry my compass in my upper left-side pocket and in the winter when you hit something while driving the snowmobile the compass gets compressed between your chest and handlebars. I have recently been training on a compass in Mils instead of Degrees, it really takes some getting used to this new measurement.

Mike