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With the current glut of survival knife niche internet websites that have popped up, I believed it sensible to write my own guide to picking out the best survival knife in order to dispel some of the misinformation out there. That stated, you are here since you want a knife, and presumably a single that you can use to survive in the occasion of a life or death scenario.<br><br>This will not only save you hours of investigation time, but you can be rest assured that these have only been chosen and put on this list after thorough private testing and discussion with other knifeSo with out additional ado, let's move onto these astounding survival knives. I personally appreciate the balance of this survival knife and can appreciate the amount of hard work that would have gone into producing the style and high quality prime-notch. Also, it really is a wonderful way to honor those American soldiers who lost their lives in Afghanistan and Iraq simply because this knife was conceived as a tribute to Officer Marc Lee of the US Navy SEAL. Added survival equipment involves sewing needles, band-aides, matches, surgical blade, and magnifier Categories of Knives<br><br>Pins. These aid hold the knife with each other and give the handle some structure when the blade is out and in use. Quality pins can make a folding knife additional tough, since loose ones can weaken an otherwise functional blade. Lock/Release. This can differ by knife, ranging from a push button on the leading of the deal with to a button on the side. Not significantly to say about these, except that you will want to adjust your habits if you happen to be used to carrying a knife with one style of lock and switch to a new. You would not want to preserve gripping the button and loosening the blade! These would be practically not possible to use as your only knife, but as a complement to other utility blades you would probably come across a neck or boot knife to be helpful as a last resort. Tactical Knives<br><br>Ka-Bar is a terrific knife maker and relatively indestructible. Their straight-blade marine knife is proven in outdoor trials, ahem, all more than the planet. SOG Seal Pup is a nicely-reviewed knife- straight blade, short serration element. I got a deal on my SOG knife as aspect of a package, but if I hadn't, I've gone with the Seal Pup. But if I had to choose only one particular knife it would likely be an Ontario RAT-7 made in Franklinville, New York, USA which is about $85 on Ontario is my preferred knife manufacturer. They use great blade steel and make blades for use by the specific forces. I personally use an Ontario Spec Plus knife for shelter developing and log splitting. You can purchase the Spec Plus 2nd Generation version on amazon for $56. Boker Plus Vox BOB Assessment<br><br>For the reason that this knife has exceeded our expectations in so numerous ways, we have decided to endorse this knife, providing it for sale right here and at our wilderness survival courses. It comes with a durable molded plastic sheath. The knife and sheath have a lifetime manufacturer's warranty. John Campbell is a former desert survival instructor from Arizona. For those who have any issues about in which in addition to the best way to use [http://Www.Thebestpocketknifereviews.com/cold-steel-spartan-review/ Cold Steel Spartan Made In Taiwan], you'll be able to e-mail us on our own site. He has been into [http://Culturalkisses.com/blogs/post/21418 wilderness survival] given that the age of 8. He grew up in Oklahoma in a little town referred to as Holson Valley and through heavy rains and ice storms he and his loved ones would be trapped for weeks at a time. Hunting, fishing, trapping, and gardening became a way of life and they would even raise their personal food animals for sustainment through these hard occasions. Blade Length – The knife blade length in inches.<br><br>We have to trust that there is a reputable purpose to use one particular variety of steel over the other and it's not just some current marketing hype. We also have to trust that the makers of our knives basically applied the variety of steel they claim, but probably a lot more importantly that they have treated, ground and sharpened the knives effectively. As lengthy as our knives execute nicely at the tasks we require, holds an edge for a affordable quantity of time, and can be resharpened with no as well significantly work, then it probably doesn't matter a lot. For those of you who like the specifics, here is a knife steel grade composition and hardness chart
 
In 1989 Bernard Russel Bowring gave formulas for the [[Transverse Mercator]] that are simpler to program but retain millimeter accuracy.<ref>Bowring, B. R. (1989). Survey Review, Volume '''30''' (Part 233), pp 125&ndash;133, [http://www.ingentaconnect.com/content/maney/sre/1989/00000030/00000233/art00006 ''Transverse Mercator equations obtained from a spherical basis''].</ref> Bowring  rewrote the fourth order Redfearn series (after discarding small terms) in a more compact notation by replacing the spherical terms, i.e. those independent of ellipticity, by the exact expressions used in the spherical transverse Mercator projection. There was no gain in accuracy since the elliptic terms were still truncated at the 1mm level. Such modifications were of possible use when computing resources were minimal.
 
==Notation==
<math> a </math> = radius of the equator of the chosen spheroid (e.g. 6378137 m for GRS80/WGS84)<br>
 
<math> b </math> = polar semi-axis of the spheroid<br>
 
<math> k_0 </math> = scale factor along the central meridian (e.g. 0.9996 for UTM)<br>
 
<math> \scriptstyle \phi </math> {{pad|0.3em}} = {{pad|0.3em}}latitude<br>
 
<math> \scriptstyle \omega </math>{{pad|0.3em}} = {{pad|0.3em}}difference in longitude from the central meridian, in radians, positive eastward<br>
 
<math> m </math>{{pad|em}} = {{pad|em}} meridian distance, measured on the spheroid from the equator to <math> \scriptstyle \phi</math> (see below)
 
E = distance east of the central meridian, measured on the Transverse Mercator projection
 
N = distance north of the equator, measured on the Transverse Mercator projection
<br><br>
 
: <math> \varepsilon \; = \; \frac {2r - 1}{(r - 1)^2} = \; \frac{a^2 - b^2}{b^2} \; </math>
 
where ''r'' is the reciprocal of the flattening for the chosen spheroid (for [[WGS84]], ''r''&nbsp;=&nbsp;298.257223563 exactly).<br><br><br>
 
==Convert Lat-Lon to Transverse Mercator==
<br>
: <math> c = \cos \phi \qquad  s = \sin \phi</math><br><br>
 
: <math> \nu \; = \; a \sqrt{ \frac {1 + \varepsilon}{1 + \varepsilon c^2}}</math>{{pad|4em}}(prime vertical radius of curvature)<br><br>
 
: <math> z = \frac {\varepsilon \omega^3 c^5 }{6}</math><br><br>
 
: <math> \tan \theta_2 \; = \; \frac {2sc \sin^2 (\omega/2)}{s^2 + c^2 \cos \omega} </math> <br><br><br>
 
::<math> \text{E} \; = \; k_0 \nu \left [ {\tanh}^{-1} (c \sin \omega ) + z \left ( 1 + \frac {\omega^2}{10}(36 c^2 - 29)\right ) \right ] </math><br><br>
 
::<math> \text{N} \; = \; k_0 \left [ m + \nu \theta_2 + \frac {z \nu \omega s}{4} (9 + 4 \varepsilon c^2 - 11 \omega ^2 + 20 \omega ^2 c^2)\right ] \, </math><br><br>
(Note that <math>\theta_2</math> must be in radians.)
<br><br>
 
==Transverse Mercator to Lat-Lon==
 
To convert Transverse Mercator coordinates to lat-lon, first calculate <math>\scriptstyle \phi '</math>, the footprint latitude— i.e. the latitude of the point on the central meridian that has the same N as the point to be converted; i.e. the latitude that has a meridian distance on the spheroid equal to N/<math>k_0</math>. Bowring's formulas below seem quickest, but traditional formulas will suffice. Then<br><br>
 
: <math> c_1 = \cos \phi ' \qquad s_1 = \sin \phi ' </math><br><br>
 
: <math> \nu_1 \; = \; a \sqrt{ \frac {1 + \varepsilon}{1 + \varepsilon {c_1}^2}}</math><br><br>
 
: <math> x \; = \; \frac {\text{E}}{k_0 \nu_1}</math><br><br>
 
: <math> \tan \theta_4 \; = \; \frac {\sinh x}{c_1}</math><br><br>
 
: <math> \tan \theta_5 \; = \; \tan \phi ' \cos \theta_4</math><br><br><br>
 
::<math> \phi \; = \; \left (1 + \varepsilon {c_1}^2 \right ) \left [ \theta_5 - \frac { \varepsilon }{24}x^4 \tan \phi '(9 - 10 {c_1} ^2) \right ] - \varepsilon {c_1}^2 \phi '</math><br><br>
 
::<math>\omega \; = \; \theta_4 - \frac {\varepsilon}{60} x^3 c_1 \left ( 10 - \frac {4 x^2}{{c_1}^2} + x^2 {c_1}^2 \right )</math><br><br>
 
(<math> \theta_4 </math>, <math> \theta_5 </math> and <math> \scriptstyle \phi ' </math> must of course be in radians, and <math> \scriptstyle \phi </math> and <math> \omega </math> will be.)
 
==Meridian distance==
Bowring gave formulas for meridian distance (the distance from the equator to the given latitude along a north-south line on the spheroid) that seem to be correct within 0.001 millimeter on earth-size spheroids.<ref>Bowring, B. R. (1983). Bulletin Géodésique (Journal of Geodesy), Volume '''57''', pp 374&ndash;381, [http://www.springerlink.com/content/x84x212363656500/ ''New equations for meridional distance''].</ref>  The symbol ''n'' is the same as in the Redfearn formulas<br><br>
 
: <math>n \; = \; \frac {a - b}{a + b} \; = \; \frac {1}{2r - 1}</math><br><br>
 
: <math> \tan \psi \quad = \quad \left ( \frac {r - 1}{r} \right ) \tan \phi \quad = \quad \left ( \frac {1 - n}{1 + n} \right ) \tan \phi</math><br><br>
 
: <math>p = 1 - \frac {3}{4} n \cos 2 \psi \qquad q = \frac {3}{4} n \sin 2 \psi</math><br><br><br>
 
: <math>Z = \left(1 - \frac {3}{8}n^2\right)(p + qi)^{2/3}\qquad\text{ where }\; i = \sqrt{-1}</math><br><br>
 
Discard the real part of the complex number ''Z''; subtract the real coefficient of the imaginary part of ''Z'' from <math>\psi</math> (in radians) to get <math>\theta</math>. Then<br><br>
 
: <math> \text{meridian distance} \; = \quad \frac{a \theta}{1+n}\left(1 + \frac {n^2}{8}\right)^2</math><br><br>
 
(Note that if latitude is 90 degrees, then <math> \theta = \frac {\pi}{2} </math> , which, it turns out, gives the length of a meridian quadrant to a trillionth of a meter on [[GRS 80]].)
 
<br>
For the inverse (given meridian distance, calculate latitude), calculate <math>\theta</math> using the last formula above, then<br><br>
 
: <math>p' = 1 - \frac{33}{20}n \cos 2 \theta \qquad q' = \frac{33}{20} n \sin 2 \theta</math><br><br><br>
 
: <math>Z' = \frac {5}{4}\left(1 - \frac{9}{16}n^2\right)(p' + q'i)^{8/33}</math><br><br>
 
Discard the real part of Z' and add the real coefficient of ''i'' to <math>\theta</math> to get the reduced latitude <math>\psi</math> (in radians) which converts to latitude <math> \scriptstyle \phi </math> using the equation at the top of this section.
 
==If Zero is not at the Equator==
As given above, all the formulas for the ellipsoid assume that the Northing on the Transverse Mercator projection starts from zero at the Equator, as it does in the northern-hemisphere UTM projection. People using the British National Grid, or State Plane Coordinates in the United States, have an additional step in their calculations.
 
The British National Grid sets Northing at (latitude 49 degrees North, longitude 2 degrees West) to be -100,000 meters exactly. It uses the Airy spheroid, with equatorial radius being 6377563.39603 meters and the reciprocal of the flattening being 299.3249645938 (both values being rounded); the meridian distance from the equator to 49 degrees latitude therefore calculates to 5429228.602 meters on the spheroid. Rounded scale factor at longitude 2 degrees west is 0.999601271775, so on the Transverse Mercator projection 49 degrees North is 5427063.8153 meters from the Equator.
 
So when converting lat-lon to British National Grid, use the formulas given above and subtract 5527063.815 meters from the calculated N.
 
==Example: convert lat-lon to UTM==
 
NGS [http://www.ngs.noaa.gov/cgi-bin/ds_mark.prl?PidBox=hv4442 says] the Washington Monument is 38 deg 53 min 22.08269 sec North, 77 deg 02 min 06.86575 sec West on NAD83; what's its UTM?
 
As with all NAD83 calculations we use the GRS80 spheroid with a = 6378137 meters exactly and r = 298.25722 2101 rounded. If we lazily take that value of r as exact we get <math> \epsilon </math> = 0.00673 94967 75479 and n = 0.00167 92203 94629. As with all UTM calculations <math>k_0</math> is 0.9996 exactly.
 
<math> \scriptstyle \nu </math> is 6386568.5027 meters at the monument's latitude<br>z is -1.43831 52572 times <math>10^{-8}</math> at the monument<br><br><math> \theta_2</math> comes out -0.00030 83836 79455 61242 radians.
 
Next get ''m'', the meridian distance from the equator to the monument:<br>
<math> \psi </math> is 38.795469019 degrees = 0.677108669 radians<br>
so p = 0.99972936 , q = 0.00122999 and the imaginary part of Z is 0.000820069 times ''i''.<br> Subtract 0.000820069 from 0.677108669 to get <math> \theta </math> = 0.676288601 radians and ''m'' is 4306233.2730 meters.
 
Plug all of that in and we get N = 4306479.5101 meters, E = -176516.8552 meters; add the latter to 500000 (the Easting value along the central meridian in all UTM zones) to get UTM Easting of 323483.1448 meters, which agrees with the NGS datasheet.
 
==References==
{{reflist}}
 
{{DEFAULTSORT:Transverse Mercator: Bowring Series}}
[[Category:Cartographic projections]]
[[Category:Conformal mapping]]
[[Category:Geocodes]]

Latest revision as of 01:04, 10 June 2014

With the current glut of survival knife niche internet websites that have popped up, I believed it sensible to write my own guide to picking out the best survival knife in order to dispel some of the misinformation out there. That stated, you are here since you want a knife, and presumably a single that you can use to survive in the occasion of a life or death scenario.

This will not only save you hours of investigation time, but you can be rest assured that these have only been chosen and put on this list after thorough private testing and discussion with other knifeSo with out additional ado, let's move onto these astounding survival knives. I personally appreciate the balance of this survival knife and can appreciate the amount of hard work that would have gone into producing the style and high quality prime-notch. Also, it really is a wonderful way to honor those American soldiers who lost their lives in Afghanistan and Iraq simply because this knife was conceived as a tribute to Officer Marc Lee of the US Navy SEAL. Added survival equipment involves sewing needles, band-aides, matches, surgical blade, and magnifier Categories of Knives

Pins. These aid hold the knife with each other and give the handle some structure when the blade is out and in use. Quality pins can make a folding knife additional tough, since loose ones can weaken an otherwise functional blade. Lock/Release. This can differ by knife, ranging from a push button on the leading of the deal with to a button on the side. Not significantly to say about these, except that you will want to adjust your habits if you happen to be used to carrying a knife with one style of lock and switch to a new. You would not want to preserve gripping the button and loosening the blade! These would be practically not possible to use as your only knife, but as a complement to other utility blades you would probably come across a neck or boot knife to be helpful as a last resort. Tactical Knives

Ka-Bar is a terrific knife maker and relatively indestructible. Their straight-blade marine knife is proven in outdoor trials, ahem, all more than the planet. SOG Seal Pup is a nicely-reviewed knife- straight blade, short serration element. I got a deal on my SOG knife as aspect of a package, but if I hadn't, I've gone with the Seal Pup. But if I had to choose only one particular knife it would likely be an Ontario RAT-7 made in Franklinville, New York, USA which is about $85 on Ontario is my preferred knife manufacturer. They use great blade steel and make blades for use by the specific forces. I personally use an Ontario Spec Plus knife for shelter developing and log splitting. You can purchase the Spec Plus 2nd Generation version on amazon for $56. Boker Plus Vox BOB Assessment

For the reason that this knife has exceeded our expectations in so numerous ways, we have decided to endorse this knife, providing it for sale right here and at our wilderness survival courses. It comes with a durable molded plastic sheath. The knife and sheath have a lifetime manufacturer's warranty. John Campbell is a former desert survival instructor from Arizona. For those who have any issues about in which in addition to the best way to use Cold Steel Spartan Made In Taiwan, you'll be able to e-mail us on our own site. He has been into wilderness survival given that the age of 8. He grew up in Oklahoma in a little town referred to as Holson Valley and through heavy rains and ice storms he and his loved ones would be trapped for weeks at a time. Hunting, fishing, trapping, and gardening became a way of life and they would even raise their personal food animals for sustainment through these hard occasions. Blade Length – The knife blade length in inches.

We have to trust that there is a reputable purpose to use one particular variety of steel over the other and it's not just some current marketing hype. We also have to trust that the makers of our knives basically applied the variety of steel they claim, but probably a lot more importantly that they have treated, ground and sharpened the knives effectively. As lengthy as our knives execute nicely at the tasks we require, holds an edge for a affordable quantity of time, and can be resharpened with no as well significantly work, then it probably doesn't matter a lot. For those of you who like the specifics, here is a knife steel grade composition and hardness chart

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