Before you spend your money on military compass, start by familiarizing yourself with the various types. A lensatic compass, also called a military compass, is a more advanced and useful version of a magnetic compass. It has its advantages and disadvantages over the orienteering compass one advantage is its probably more accurate when it comes to shooting azimuths, meaning the act of determining the specific compass direction to a spot on the earth. When the magnetic needle is suspended freely and balanced properly. The graduations on the compass are located on a light aluminum ring fastened to a needle such that the zero point on the graduation scale coincides with the south point of the needle. It is balanced for northern and southern hemisphere use. This type of compass, being a very light and simple instrument, is extensively used for preliminary surveys of roads, rough traverses, etc. Portable document format pdf and includes the ibm documentation browser to help you find. Military map reading this booklet is to help qualified defence map reading instructors in unit map reading training and testing.
How to survive alone in the wilderness for 1 week eastern woodlands duration. Aline or plane passing through geographical north pole and geographical south pole magnetic meridian. The two basic techniques for using the lensatic compass are the center hold technique and compasstocheek technique. Using a lensatic compass the effects of iron ships on the compass needle, with their permanent and induced magnetism, are very complicated to describe and have been the subject of much study. Place the fully opened compass on the map with the scale edge alongside a northsouth meridian longitudinal line, grid line. Using a lensatic compass the effects of iron ships on the compass needle, with their permanent. Compass surveying chain surveying can be used when the area to be surveyed is comparatively small and is fairly flat. From your known location on the map, you take your protractor, line it up to true north, find the angle to your next point, adjust for declination, and then shoot that angle with your.
The british prismatic marching compass was made of brass painted over in black and had a mother of pearl compass card dial which glowed in the dark. Now, take your map and draw lines at the back azimuth angle you calculated on the map through the features that youre using as reference points. The term lensatic comes from the fact that there is a. Milsurps knowledge library compass, prismatic, mk3 by. The term lensatic refers to the magnifying lens that helps you use the compass more effectively. A lensatic compass is often referred to as a military compass, and is typically used by the u. Prismatic compass surveying pdf notes expert civil. A compass is an instrument that is used for navigation and mapping because it measures the geographic.
The term lensatic comes from the fact that there is a lens on the rear side of the compass that aids in the orienteering process. Feb 01, 2017 how to use a lensatic compass for beginners cammenga 3h duration. Difference between prismatic compass and surveyors compass november 4, 2017 january 26, 2018 by kathir 6 comments. If youre reading this, it is very likely that youre scouting for the best military compass. Proster military lensatic compass ip65 sighting compass with clinometer multifunctional metal compass fluorescent tritium compass for camping. Lensatic compass b170249 student handout basic officer course.
Solo overnighter using old school military gear and campfire chili mac duration. If these parts are not luminous, the compass should be surveyed. Made from durable and clean, scratch resistant acrylic that can stand up to the rigors of camping or. There are two methods to using a military compass, the center hold technique or the more accurate compass tocheek technique.
Compass explore our selection of rare and antique compasses. The first compasses were made of lodestone, a naturally magnetized stone of iron, in han dynasty china 20 bc 20 ad. This lovely chap, stuart, will repairrefurbishclean a stanley g150 prismatic compass for a reasonable price. The prismatic compass was invented by charles schmalcalder and patented in 1812. Compass, prismatic, mk3 by peter laidler i am a compass maker by trade, and this article, while obviously written in good faith, gives fatally flawed information that will lead people to carry out work on beautiful, precision instruments, that will do such damage as to possibly render the compass beyond economical repair. But when the area is large, undulated and crowded with many details, triangulation which is the principle of chain survey is not possible. Suunto provides this useful compass that uses a fixed declination correction scale. Originally issued to officers, it was probably one of the finest compasses in use at the outbreak of world war ii. Aug 30, 2007 this lovely chap, stuart, will repairrefurbishclean a stanley g150 prismatic compass for a reasonable price. Compass surveying the prismatic compass the prismatic compass is a magnetic compass which consists of the following parts. There are a variety of different types and models of compasses, such as baseplate, sighting, prismatic, and electronic. A prismatic compass is a navigation and surveying instrument which is extensively used to find out the bearing of the traversing and included angles between them, waypoints an endpoint of the lcourse and direction. It has a 218inch dia face marked in 5degree increments, a 14inch dia sight lens, 916inch dia bubble level, and a 112inch sight with crosshairs.
This document is in pdf format on the ibm documentation. The booklet can be used by all ranks of hm forces rn, rm, army and raf for study and revision. The traditional milspec liquid prismatic compass is currently in service with numerous armies around the world, built to meet the exacting accuracy and high specifications demanded by users worldwide. Cammenga official us military tritium lensatic compass. How to use a military style sighting compass gone outdoors.
Cmmg official us military tritium lensatic compass. Best military compass 2018 buyers guide holiday expert. Compass british army military style prismatic lensatic liquid filled sighting compass 58 pattern. The primary source is the manual of map reading and land navigation, army code 71874. Apr 05, 2020 a prismatic compass uses a prism to allow the reading of the card and viewing of the object of interest together, hence the name. Tbspat1002 given a military topographic map, protractor, lensatic compass, and objective, navigate with a map and compass, to arrive within 100 meters of the. The two basic techniques for using the lensatic compass are the center hold technique and compass tocheek technique. This shopping feature will continue to load items when the enter. Step action 1 open the compass so that the cover is fully extended. The case cover should be pointing toward the top of the map. It has its advantages and disadvantages over the orienteering compass one advantage is its probably more accurate when it comes to shooting azimuths, meaning the act of determining the. Model 3h cammenga lensatic compass specification official current genuine gi issue u. Prismatic compass surveying pdf notes download compass surveying prismatic compass compass traversing important definition true meridian.
Difference between prismatic compass and surveyors compass. The british mk iii compass is a good example of a prismatic compass. However, after giving you the top list, i will also give you some of the benefits you stand to gains for using it. How to use a lensatic military compass navigate safely. Do not place the compass under a light source prior to use. Theyre also called military compasses because this is the design used by the us military. Cammenga precision lensatic instructional booklet pdf download. The following documentation also comes with the server. How to use a lensatic compass for beginners cammenga 3h duration. Military compasses and those designed similarly are simple to use and can be found at many outdoors supplies or military surplus stores. This chapter focuses on using a baseplate compass because it is a common, inexpensive. Lensagic ships compass has a rotating graduated disc, like the lensatic compass, and the fixed index is called the lubbers line. Those lines will intersect at some point if youre done your.
Selfluminous tritium gasfilled tubes, no light source required, 10year luminous life expectancy. Cylindrical metal box cylindrical metal box is having diameter of 8 to 12 cm. North arrow of the lensatic compass will point 11 degrees west of true north. Open the compass cover containing the sight to a vertical position, making it form a right angle with the dial portion of the compass. From the 18th century work of master craftsmen like george adams of fleet street, to colonel verners first world war service compass and the iconic designs of francis barker. Some people may think that compasses are too hard to read but most come with a manual that will teach you how to reach the particular compass you have chosen. As can be seen from photos prismatic compass in good condition having a small amount of wear and tear. There are two methods to using a military compass, the center hold technique or the more accurate compasstocheek technique. Let the compass rest on your thumb and index finger. A lot of compasses are called prismatic when they are not. The prismatic compass has been designed to give accurate magnetic headings. Liquid prismatic handbearing compasses m73 liquid prismatic compass part numbers. The traditional milspec liquid prismatic compass is currently in service with numerous armies around the world, built to. How to use a lensatic military compass navigate safely in.
Lift the compass, and make sure it is at your eye level. In military prismatic compass is used and full form of it is service prismatic compass mark iii alpha. The table below lists the steps to perform the centerhold technique. Turn the map and the compass together until the north. Campers, bikers, boaters, hunters, foresters, surveyors and many more all use compasses in their businesses and lives. The lensatic compass is comprised of different parts compared to a baseplate compass. Disadvantage of chain surveying is that, in it only distances are measured and hence area is to be covered with a. Proster military lensatic compass ip65 sighting compass with clinometer multifunctional metal compass fluorescent tritium compass for camping hunting hiking geology activities. Put your thumb into the thumb loop, which is located on the side of the compass. The cover contains the sighting wire, and serves to protect the compass when closed. The rear lens flips out when the compass is open, and is used to read the dial. A prismatic compass uses a prism to allow the reading of the card and viewing of the object of interest together, hence the name.
Sight to the target with the compass turn the ring to align the orienting arrow with the red end of the magnetic needle read the bearing from the ring at the index line. Military compasses army navy sales army navy sales. Since 1848, pyser optics have been manufacturing the finest, highest quality range of liquid prismatic compasses in the world. Get the ultimate direction finder, a lensatic compass. Open the compass cover at a 90degree angle and then set the lens bracket at a 30degree angle. The name prismatic compass is given to it because it essentially consists of a prism which is used for taking observations more accurately. Tbspat1002 given a military topographic map, protractor, lensatic compass, and objective, navigate with a map.
Using a compass to get a bearing to a distant target. Jul 11, 2019 lensagic ships compass has a rotating graduated disc, like the lensatic compass, and the fixed index is called the lubbers line. Using a compass to sight a bearing to a distant target. Military precision lensatic compass instructional booklet 100 aniline avenue, suite 258 holland, michigan 49424 phone 616 3927999 fax 616 3929432. The base forms the body of the compass and holds the needle, dial and rotating scales. The compass was later used for navigation during the chinese. Instructions for the us army lensatic compass pdf instructional booklet for military lensatic, magnetic compass the instructions in this booklet are for the lensatic, magnetic compass currently being the lensatic compassalso called a military compassis a precision instrument that when used with a topographical the. Survival compass 10 function military style compass and survival tool. The compass body is constructed mainly from brass and incorporates a bellows expansion system to allow for volumetric changes in the damping fluid contained within the capsule. Instructions for the us army lensatic compass pdf instructional booklet for military lensatic, magnetic compass the instructions in this booklet are for the lensatic, magnetic compass currently being the lensatic compass also called a military compass is a precision instrument that when used with a topographical the.
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