Having received my RAT E&E Kit, and replaced the cheapo compass with one that points North, I decided to take it appart and explain in pictures why these 11mm chinese button compasses are so bad and so unreliable....
Firstly, the smaller the compass, the more dangerous an air bubble is, because there is far less material to break the resistance formed by the presence of the bubble. So if you are ever forced to carry an 11mm plasitc button compass, always go for an air filled compass and not a liquid filled one. The 11mm liquid filled compass is the absolute worst compass you can buy in terms of both performance and reliability.
Secondly (and I don't expect RAT to take the blame for this), these cheapo chinese compasses have no quality control as we in the west would understand it, and RAT or any other reseller won't quality control what they resell either. These compasses are mass produced by people who don't have any interest in quality and are happy for their bag of rice at the end of the day.
This is the dial from the RAT Survival Compass as included in the RAT E&E Kits. It consists of a wafer thin sheet of printed polyethelane with a little metal cup in the centre that sits on the head of a pin. So how does it point North? Floating disk compasses are all made the same BTW, regardless of size.
The disk is glued to a conventional compass needle, and as you can see, the accuracy of the compass is determined by how well the old lady or has glued the disk to the magnetic needle. In this example, the variation between magnetic north and where the compass points is about 8 degrees. Of course you can't expect anyone manufacturing 2 cent compasses to quality check anything, and these things really do sell for 2 cents each when you buy them in bulk. Notice also that the needle has started to rust, probably due to the presence of the air bublble.
So the only question is, shouldn't RAT be placing US products that are quality checked in their RAT E&E Kits? At the very least, shouldn't they be putting in something that could be used in an E&E situation?
If RAT already stock the 22mm button (for inclusion with the fire kit), for safety sake please start shipping the 22mm button in the E&E Kits in place of the 11mm. The price difference is miniscule, as is the space, and even if it benefits just one customer who needed to use it for real, it would shurely be worth it.
Some may argue, "Who gives a F in an E&E situation where your compass points?" or, "What does eight degrees matter? It's only an estimate." But when you add the erroneous effects of an air bubble onto the build in manufacturing error, you can be looking at some 15-20 degrees out. That is down right dangerous.
Suffice to say, if you guys wanna pack one of these little plastic babies as a backup, go ahead. It's your call. But believe me, it is the very worst possible compass on the market (until we get an 8mm model out of China that is).