Hence 1 metre equals 1 mil at 1000 metres: Excellent this possibility to have a better look on the model! Mils/10) Two-hand Hold of the Lensatic Compass. Putting the two in a opaque bag or enclosure is effective as well. ibformation. Tritium is considered safe for external use because it is a weak beta particle emitter – so weak in fact that the radiation it emits cannot penetrate human skin. Some have gotten it down in a couple of days and others take a bit longer. Thus (in mils): E = 1600; NE = 800; NNE = 400, etc. Modest price. To use your lensatic compass to find the direction of your intended azimuth which you probably got from your map, using your protractor:. X Old Each degree is divided into 60 minutes, each minute into 60 seconds. In reality, there are effectively only two broad categories of compass types: clear base plate models used for orienteering and lensatic compass, effective for distance sighting with mirrors. The wire is raised perpendicular to the dial while the lens is inclined towards the dial. According to United States Army Corps of Engineers, the engineer compass is also called a lensatic compass. Two varieties of magnetic compasses are standard for military use today: the lensatic compass (fig. Lensatic Compass gives an introduction to the use of the compass. tanß ~ ß. or the size of a single object is equal Worked well ! These three major components can be broken down even further. That is 2 * 3.1416, or 6.283 radians. In the southern temperate zone, point the 12 in the direction of the sun, and then north is halfway between the 12 and the hour enyineer. Place the fully opened lensatic compass on map with the scale edge alongside the Magnetic North line of the declination diagram. equal to the Range expressed in the sine and/or tangent of that angle is the angel. Distances like this can be determined from the map, or from a vehicle odometer, if great precision is not required. An engineer lensatic compass, also known as a hand compass or sighting compass, allows you to take bearings on physical landmarks which can then be used to determine your exact position on a map or navigate toward the landmark even when it can no longer be seen. Thus when using a compass graduated in mils for small A lensatic compass has a lens and wire which can be unfolded. B170249 Lensatic Compass 3 Basic Officer Course Lensatic Compass Learning Objectives (Continued) Enabling Learning Objectives TBS-PAT-1002k Given a lensatic compass, a surveyed point with a level platform, an azimuth marker, and a surveyed known direction, inspect the lensatic compass, to … They are all artistically enhanced with visually stunning color, shadow and lighting effects. 5-26) and the artillery (M2) compass. to the mils wide it is multiplied by the Line up the sighting groove in the bracket with the wire and an object in the enginwer. You also have the option to opt-out of these cookies. Usually, a diagram called a compass rose shows the directions north, south, east, and west on the compass face as abbreviated initials. Virtually every book and instructor will go out of its way to point out that in experienced hands, either type of compass can be highly e… These cookies will be stored in your browser only with your consent. It has 0 to 90 degrees from North to East. Then, from where you are, shoot an azimuth to the feature as accurately as possible, and calculate the back azimuth from that reading. How to shoot an azimuth for fun and profit: Get the ultimate direction finder, a lensatic compass. Degrees: A compass divided into 360 degrees is the most common unit of measurement. A compass is an instrument used for navigation and orientation that shows direction relative to the geographic cardinal directions (or points). Mils: The point where those lines cross is your location, and the accuracy of that location is only as high as the readings and calculations that you’ve made. The table below lists the important parts of the compass and their functions. Chapter 7 OVERLAYS Purpose Map Overlay Aerial Photograph Overlay Chapter 8 ... Lensatic Compass Compass Handling Using a Compass Field-Expedient Methods Global Positioning System Chapter 10 ELEVATION AND RELIEF Definitions Each centigrad can be divided into 100 centi-centigrads (cc). The Law of Sines gives us the unknown sides: The “lensatic” means that the rear sight is provided with a lens that allows you to read the dial while your eye is close to the rear sight, as it should be. For angles measured in radian (i.e. Turn your entire body as a unit until your predetermined azimuth falls under the fixed black index line. Mils (i.e. The width of an object is Orient the map by taking the straightedge on the left side of the compass and place it alongside the north-south grid line with the cover of the compass pointing toward the top of the map. is the equation for that? meters. We'll assume you're ok with this, but you can opt-out if you wish. LENSATIC COMPASS. We also use third-party cookies that help us analyze and understand how you use this website. I generally line it up with a north/south gridline. after 53 years on ships, I was asked by a friend why her PRECISION COMPASS. A bearing of South 15 degrees East would be the same as 165 degrees (180 degrees minus 15 degrees). The lensatic compass is comprised of different parts compared to a baseplate compass. A typical lensatic compass is shown at the right from FM Here, they agree, so there is no deviation and the measurements have been accurately taken. Maybe I will look for a new one with degrees on, but for now I am Cammenga quality. Use the illustration above to familiarize yourself with the components of a lensatic compass. Mil-radians are called mils for short. miles: 1 mm equals 1 mil at 1000 mm: 1 rod equals 1 mil at 1000 A plumb bob can lesatic suspended so that it cuts Polaris, and the bearing to the plumb bob cord then measured. lensatic compass is the most common and simplest instrument for measuring direct ion. It can also be used to orient a map. Interesting article, thanks for the Land Nav Task 10 - Orient a Map Using a Lensatic Compass Standards: Oriented the map to the ground using a compass so the north-seeking arrow of the compass was within 3 degrees (20 mils) of the angle shown in the grid-magnetic (G-M) angle of the declination diagram shown on the map. Other than this it works really well and has useful luminous Each grad can be divided into 100 centigrads (c). Declination Diagram Intersection Resection Modified Resection Polar Coordinates. So with that in mind, I’ll start a series of short articles that each focus on a single tip for getting the most out of your compass. See Compass Reading for more info. Part Function Thumb loop • Serves as a retaining device to secure the compass in the closed position • Also used as a wire loop for your thumb when you hold the compass range. The older the map, the more likely the declination shown in the diagram is no longer correct. This will only give you meters though, as as the article states. This category only includes cookies that ensures basic functionalities and security features of the website. Necessary cookies are absolutely essential for the website to function properly. With this style of compass, readings such as North 20 degrees East are used. Some foreign militaries have simplified the other direction and divided the compass face into 6000 units, exactly like the face of a watch, with 100 units the same angle as a minute on the watch face. According to United States Army Corps of Engineers, the engineer compass is also called a lensatic compass. A diagram always helps to keep the direction of the declination straight. A round lensatic compass has no straight edge to align. Instructor Kit - Student Workbook. A typical lensatic compass is shown at the right (from FM 21-25). Nevertheless, using a compass and map should be a basic skill for anyone who travels today, Whether or not they use GPS. -Nomenclature The lensatic compass consists of three major parts: cover, base, and lens. The use of the compass is responsible for some of the oddities in the early public land surveys. How to Use the Engineer Compass. Or, two vehicles that appear to be 100 mils apart and are 1000 meters away, are actually 100 meters apart. Lay the map in a horizontal position. This website uses cookies to improve your experience while you navigate through the website. The map is now oriented to the terrain. about distances between objects is Especially, if you have a hill in front of you. Both styles rose in prominence during World War II, with the lensatic model becoming U.S. Army standard issue during that time and remaining so today. Sighting on a man (approximately 6 feet tall) who appears to be 12 mils tall must be about 500 feet away. There are 400 grads in a circle where 100 grads = 90 degrees. I cannot find the origin of the word “compass” as applied to the magnetic compass. Instead you will use an imaginary line that runs down the center of the compass. To the north of State Route about 2 miles east of Windsor, Colorado there is Antelope Hill, a two-peaked hill about 50 ft. Grads: The grad is a metric unit of measure, not commonly used. If he seemed 3 mils tall, he'd be 2000 feet away. angle. Adjust the map (with compass on it) so that the compass cover points to Magnetic North (North arrow of compass is pointing directly to the Index Line). With a Lensatic Compass and the know-how, you have gained today, you can become a “Landmaster” in a short period of time. Adjust the map (with compass on it) so that the compass cover points to magnetic north (n arrow of radians) is that of the "small angles" (usually less Learn how to use the lensatic compass used by the US Military. Lay the compass down on the map so its long side is parallel with the north/south axis of the map. AUTOVALORES E AUTOVETORES EXERCICIOS RESOLVIDOS PDF. With the lensatic compass opened wide (fig. 1 meter equals 1 mil at 1000 meters Nowusing a straight edge, draw the bearing line and extend it in the desired direction. Place the fully opened lensatic compass on map with edge of the scale alongside the Magnetic North Arrow of the declination diagram. A typical lensatic compass is shown at the right from FM Here, they agree, so there is no deviation and the measurements have been accurately taken. Sighting the bearing. A handheld compass is not able to measure down to a minute, let alone a second, but those units are used for precise locations using latitude and longitude. on the back so you can calculate the sine of the angle but the The term “lensatic” refers to the magnifying lens that helps you use the compass more effectively. FAX ( ANILINE AVE. HOLLAND, MICHIGAN I get lots of questions via email from people wanting to know how to use a lensatic compass, and I think I’ve covered that pretty well in a series of two posts. A bearing of South 70 degrees West would be the same as 250 degrees on a normal 360 degree compass (180 degrees for South plus 70 degrees). There are 2 PI radians in a circle. We’ll talk more about how they are used since this skill can be amazing for search-and-rescue missions, or for finding your way to somewhere that no one has ever been before. TRAINING OUTLINE 1. An object that appears to be n mils wide when it is 1000 units away from you, is actually n units wide - the units used does not matter, feet, yards, meters, miles I had no idea radians / mils When hiking, use a map to help you navigate unfamiliar terrain. A compass divided into 360 degrees is the most common unit of measurement. A vehicle that appears to be 15 mils long and is 1000 feet distant is actually 15 feet long. If Points: Cheap, basic compasses may be marked with the cardinal points of North, East, West, and South with the intercardinal points of North East, South East, South West, and North West between them. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are as essential for the working of basic functionalities of the website. The sun sends ionizing ultraviolet radiation reaching the earth in about 8 minutes after it is emitted, and streams of particles, mainly protons, that take longer to reach the earth. see that the distance between two objects Learn how to use the lensatic compass used by the US Military. Phone: 706-955-0245. My compass has grads round the dial - no wonder it was dirt cheap. without mills. A lensatic compass is also known as a military compass, and these compasses are used to cross terrain that may not have trails or may be more challenging to navigate. The cover will form a straightedge with the base. Lensatic Compass. Plotting a bearing on a map using a round lensatic compass. FM does not mention the use of the short line, but it can probably be used to speed up the setting of an azimuth by saving 15 clicks. This is because 6400 = 2^8 * 5^2. PI is a constant of approximately 3.1416. Since the M2 is a special-purpose compass, it is not discussed in this chapter. Take your lensatic compass and open it up all the way so it is one flat line. incorrect. A handheld compass is not able to measure down to a minute, let alone a second, but those units are used for precise locations using latitude and longitude. I cannot find the origin of the word “compass” as applied to the magnetic compass. Buy the Genuine Article Purchasing a genuine CAMMENGA LENSATIC COMPASS is easy: go to www.cammenga.com and checkout the specifications for the 3H Tritium and phosphorescent Model F27. It also has 0 to 90 degrees from South to East, Sout to West, and North to West. This can be done, for example, before beginning the day’s hike, and the compass will then be useful in conjunction with the map. For those who prefer a more cost-effective means of navigating terrain, we offer a Phosphorescent Lensatic Compass option. B182056 Lensatic Compass 4 Basic Officer Course Lensatic Compass • Components. The table below lists the steps to perform the center-hold technique. 1) and held level, turn it horizontally until the azimuth is directly under the black Index Line. Compass use of mils typically rounds 6283 to 6400 for simplification. The lensatic compass is the most commonly used and simplest instrument for measuring directions and angles in the field. what is one mil at 2000 meters and what From these bearings, the angles A and B can be determined. This is a low level radioactive isotope that is used in a multitude of applications where self-powered illumination is necessary. Contact Us ROC Gear is located at: 121 Commerce Commons Commerce, GA 30529. Divide each radian into 1000 mil-radians and you see there are 6283 mil-radians in a circle. angles you are actually reading  the sine or the tangent of that Some compasses may be marked in degrees only from 0 to 90. This makes calculating distance etc. So sinß ~ North is at 0 degrees (and 360 degrees), East is 90 degrees, South is 180 degrees, and West is 270 degrees. Things Cpmpass Engineer lensatic compass. By this algebraic formula, we can * LENSATIC *. 4, Section I). (The compass in the Degrees section actually has MILS in black numbers on the inner portion of the face.). were used on compasses. and 1 foot equals 1 mil at 1000 feet: 1 mile equals 1 mil at 1000 Next, rotate the entire thing (map and compass) until your compass is telling you that it's pointing north. In the northern hemisphere, the field points downward to the north, so the south end of the ,ensatic must be weighted. it is. Phosphorescent Lensatic Compass 27 Lead How Others Can't Lead. you look at a surveyor's compass there is usually a sine table Take your lensatic compass and open it up all the way so it is one flat line. See this example. This website uses cookies to improve your experience. 58CE Rally Compass. At the time of writing this evaluation the 3H was priced at $89.95 and the Model F27 at $49.99. Then by looking through the lens you can read the bearing off the dial. Cody - I think you'll find that the mil scale is unit independent, Lensatic Compass. It is magnetictrue or grid when referred to magnetic north, geographical north or grid north, respectively. Locate yourself and a prominent distant object on the map, and measure its magnetic bearing with the compass. 9077 Lensatic Compass. The article forgot to mention a very important feature of using @Eduardo - Since it is twice as far away, it is twice the size = 2 rods: etc etc etc. Good article my friend. Conversely, if you know the size of an object, you can estimate its distance from you. thousandths multiplied by the mils wide It has a 2-1/8" dia face marked in 5-degree increments, a 1/4" dia sight lens, 9/16" dia bubble level, and a 1-1/2" sight with crosshairs. A lensatic compass is often referred to as a military compass, and is typically used by the U.S. Military. It will be impossible to have an accurate artillery fire support Imagine my embarrassment when, With the compass held to your eye you align a notch on the lens holder, wire, and target much like iron sights on a rifle. than 30 degrees). 2. 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. markers on the N needle the direction arrow and the backplate. Paradoxically, the "mil" system sits better than the "degree" system with the old "cardinal points system. so much easier. 17.78 mils equal 1 degree. Ok so if 1 mil = 1meter at 1000 meters They’re also called military compasses because this is the design used by the US Military. The azimuth is the angular measurement of an object’s direction in relation to the viewer. Declination is extreme and rapidly changing with position in polar areas, making the compass worthless as a navigation aid there. Our new CrystalGraphics Chart and Diagram Slides for PowerPoint is a collection of over 1000 impressively designed data-driven chart and editable diagram s guaranteed to impress any audience. CAMMENGA. Techniques for Using the Lensatic Compass. Page 8: Proceeding Along An Azimuth 3rd Method 1. E-mail: mail@rocgear.com However, your W=RM rule If the tops of two mountains are 1 mile apart on your map, but they appear to be 100 mils apart, you must be 10 miles away. Proper use of a compass is a basic but essential skill in backcountry hiking, which often involves getting off marked trails The lensatic Read more. The two basic techniques for using the lensatic compass are the center hold technique and compass-to-cheek technique. PROVEN • RUGGED ACCURATE. The Cammenga 3HCS has mil markings for military applications and degree markings for orientation and normal land navigation. 90 $100.00 $100.00 (as seen in Diagram 1) Lensatic Compass gives an introduction to the use of the compass. The lensatic compass is a very common style because of its accuracy and its many uses. These compasses just provide your general direction when accuracy is not necessary. The instructions for use that follow will be based on the lensatic model, since it is the more durable of the two. doesn't need the table. The compass card may have a sapphire cap and an agate point for its pivot. Cammenga Official US Military Tritium Lensatic Compass, Accurate Waterproof Hand Held Compasses with Pouch for Hiking Camping Navigation Survival Backpacking Orienteering 4.8 out of 5 stars 1,082 $86.90 $ 86 . That means 20 degrees towards East from North. Declination Diagram, Fig. Example: you want to follow an azimuth of 120 degrees. Many manufacturers will often group their compasses into three categories: professional, sports, and recreational. BHAGWAN THE GOD THAT FAILED BY HUGH MILNE PDF. ok with mine. The lensatic compass is (was) the typical military field compass, and is used principally to measure or lay out magnetic bearings. Another unit of measure, the radian, is used mainly by militaries in artillery, tank, and mortar gunnery. A lensatic compass, also called a military compass, is a more advanced and useful version of a magnetic compass. Using mils, the actual size of an object observed in the field can be estimated. This compass is essentially the same trustworthy model supplied to … If you don’t happen to be in Northern Colorado, you can construct a similar example any convenient place near you, and do it as a compass or a map exercise. But opting out of some of these cookies may have an effect on your browsing experience. Looking at the photo below, let’s say you’re at the north end of Enginser Lake, where the penciled X is. In the daytime, you’ll normally find something in the distance on your azimuth and walk to it, so you don’t have to keep staring at the compass. range to target expressed in thousandths. same compass used in the military, an M2 compass, usually Each degree is divided into 60 minutes, each minute into 60 seconds. Two parts of this line include the sighting wire, which you can align with things that are visible on the map, and the center of the rotating compass card. Step Action 1 Open the compass so that the cover is fully extended. compass was divided from 0 to 64 and I didn't know! These variations are caused by ionospheric electron currents at altitudes of about km, and result from sun-earth interactions. A plot of the traverse can then be made, and the enclosed area calculated. Irregular magnetic storms are periods of greatly increased ionization. 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