Baseplate Compass or Lensatic Compass: Which One is Right for You?
Serious outdoor enthusiasts are divided on the question of whether to pack a lensatic or baseplate compass. Here’s a quick rundown of the differences between these two types of compasses in terms of ease of use, precision, and packability to help you take sides.
A baseplate, compass, also called a protractor or orienteering compass, uses a magnetic needle dampened by fluid in a clear, plastic housing. A rotatable dial, called a bezel, is used to set the compass. Many models have a folding mirror that is used to read the compass bearing while sighting a distance object at eye level.
Replace the mirror with a small, fold up magnifying lens, and the compass needle with flat, circular compass card (or disk), and you have a lensatic compass. Instead of fluid to dampen the movement of the needle (or card in this case), the lensatic compass uses a process called electromagnetic induction — no fluid necessary.
Ease of Use
Neither compass is clearly easier to use than the other. The lensatic compass may be slightly easier for beginners to comprehend because a dial does not have to be set. A person can turn slowly in a circle and see how reading the compass through the lens always shows the current direction. A baseplate compass must be set before reading the bearing. This extra chore, enables the baseplate compass to have an adjustable magnetic declination setting, which removes the need for addition or subtraction with each bearing, as is required with the lensatic compass.
Which Has the Highest Level of Precision?
Used properly, both types of compass can produce reasonably precise readings, but the lensatic compass has a slight edge. The narrow, magnified field of view seen through the lens, with just a glance down to read the direction, is a powerful combination. However, for most outdoor recreational activities like backpacking and hunting, a degree or so extra precision probably isn’t going to be the deciding factor.
Packability
Weight is factor that could be very important in any type of long-distance activity. A Suunto MC-2G weighs less than half of the lensatic compass’ 7oz., and is only about a half inch thick. A Lensatic compass, by comparison, is closer to two inches thick and much less streamlined. That weight and bulk is due to the sturdy aluminum design. Lensatic compasses like the Cammenga Model 27 have a reputation for being nearly indestructible.
Need to know more about choosing a lensatic compass? Stop by Compass-HowTo.com to learn everything you need to know about finding the perfect compass for your needs. You’ll also see compass reviews and recommendations, and resources for learning to use a compass.
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