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Brunton TruArc 3 Base Plate Compass
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- Brunton Product
- Includes compass
- Great for camping
- 2 Degree resolution
- Inch/CM Scales
- Global Needle
- Made in the USA
- U-Proof Warranty
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|Package Height||1.1 x 4.2 x 8.1 inches|
|Shipping Weight||0.1 pounds|
Brunton offers a high level of field precision for today's most demanding outdoor adventurer and the TruArc 3 Base Plate Compass is a great example of this. It's a scouting compass with modern updates, equipped with the TruArc Global Needle system in the characteristic form outdoorsmen have trusted for generations. Metric and standard scales, and tool-less declination compensation, plus no-frills reliability make this a must for everyone's outdoor pack.
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The baseplate of TruArc3 is from the Brunton OSS 10B. The OSS line typically used Brunton's needle-with-hole design. Both OSS and the 9020 line were never promoted for global use by Brunton, but both had some models use Brunton's deep well capsule and "top hat" pivot found in TruArc3. Silva thought the balance adequate for both hemispheres as was, and simply called it something to match. The top hat allows the needle more up-down free play for magnetic inclination that is matched with the depth of the capsule, so its more resistant to dragging on the capsule's floor or roof, thus its more global ready.
If all you need is a time tested compass capsule in a rugged, easy to hold shell, is no-nonsense and can be used likely anywhere in the world, this is it. The ruler markings on the side are the minimum needed to estimate distance from a map, whether metric or USA units.
Multi-zone needle: used in the northern hemisphere, Brunton's design is less prone to lock in motion as its balance is maintained at more angles off horizontal, which reflect usability in various "compass zones". The needle is steady enough to take a general heading in motion. I tested the TruArc needle was similar to the 9020 by using a bar magnet beneath working compasses to emulate magnetic dip; I reduced the distance of the magnet to attract one end of a compass needle down until it dragged on the capsule bottom; I compared the distance [ i.e., equivalent to the field intensity] required to drag a Northern hemisphere balanced Cammenga military compass, Suunto Clipper, A Brunton Classic and a Suunto MC-2G. The Cammenga and Clipper dragged at ~ 6cm, the Classic and TruArc3 at 2cm, while the Suunto never dragged
The capsule is large enough for 1 degree resolution
Global needles are optimal for world use, and under $15 is a steal. A Suunto or Recta model with a Global needle runs > $50 but its needle design is most lock proof
Declination adjustment is typical of the Brunton design, squeeze capsule and spin, easy to fix without tools
fast responsive needle
good damping [ i.e., no overshoot or oscillation] nearly as fast versus Suunto MC-2G which is nearly zero
Brunton quality: there are very few quality compass makers left in the world and Brunton is one of them, the needle design is uniquely Brunton. An important item difficult to test [ i.e., you have to destroy the compass] is how long a needle retains its magnetism over time and its durability in the field: water, drop and sunlight proof. Brunton's compass reputation has been good; an article states Brunton uses cobalt chrome alloys for needles, which are good magnetic steels, and its only fault has been ergonomic design rather than the fidelity of the compass capsule, and I have a working Brunton classic over 10+ years old
Its fluid filled
All the flaws of the OSS 10B design are carried over, but if you accept that when you buy it its not a limitation
There are no cardinal points in the degree markings, they are on the side of the bezel which you can't see
Degree scale is a printed decal on top of the capsule, the design is prone to parallax errors when reading map headings, best to use one eye
the paper/plastic decal will likely be damaged by constant harsh exposure
Print font is small for some users
Needle is smooth moving, no snags or stops, no bubbles in fluid. Easy to read scales and markings. This is my second Brunton.