I recently sent a USGI Cammanga Lensatic Compass through the washing machine and briefly through the dryer in the name of science (or maybe I just forgot to take it out of my pocket). I am am happy to say that it passed the washer and dryer test with flying colors. These are compasses are TOUGH.
The compass displayed no additional paint chipping (it was already quite well worn). No moisture made it into the capsule and there was no fogging. The sighting wire is still straight and intact. All of the tritium elements are still intact and working. The rotating bezel is still in place and clicks positively.
There are compasses that are lighter in weight. There are compasses that have more features. There are compasses that require less additional map tools. But there are few compasses as tough as the USGI Lensatic compass and few that make taking relatively precise azimuths as easy. I own other compasses, but I often find myself reaching for one of my old USGI Lensatics because I know them and trust them.
Note: Stay tuned for some upcoming compass and map tool reviews. I hope to take a look at some of the excellent UTM tools from MapTools.com, the venerable Brunton 15TDCL (AKA the real Silva Ranger), and the superb Suunto MC-2 Global.