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H3 Firefly Self Illuminating Compass Mils

Utilising the Plastimo IRIS 50 hand-bearing compass, this self-illuminating compass in NATO Green is equally effective for night, day and dusk navigation. The compass is small enough to fit neatly into the palm of the hand or be worn around the neck without undue interference and large enough to be used in marine and vehicular applications. The night time use is optimised over the standard IRIS 50 compasses with the use of absolutely reliable Traser Trigalight sources without the need for batteries, bulbs or switches. The Trigalight sources consist of four gaseous tritium light sources which provide a completely independent means of light generation. No batteries or charging with ambient light are required. There are no associated moving parts and because the unit is continuously energised, there is no need for a switch. The compass lights will remain energised for 10 maintenance-free years, even during extended periods of complete darkness. The tritium sources are non-emissive and completely sealed, suitable for use in temperatures ranging from -40C to 80C and will operate under water. They are safe for operation in Zone 0 hazardous atmopsheres. The soft bottom cell prevents leaks and bubbles. The outer case is of tough, lightweight construction in a smooth, non-slip casing. The compass on its own weighs 96 gm, measures 83mm diameter and is 33mm high. The mils compass shows markings in mils. Due to Royal Mail losing products, this item will only ship by Special Delivery and will incur the Special Delivery shipping charge.

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The compass under low light conditions, showing the illumination and clarity of display.

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What our customers say about this product:

I couldn't resist your request for a definition of a Mil: this is the angle created by a right angled triangle with length ratio 1000:1, i.e. 1m at a range of 1km. In trigonometric terms this is a milliradian and there are 2 x pi of these radians in a full circle, or 2 x 3.14159 ... etc. A reasonable approximation to this is 6400 milliradians in a full circle and this number is used for military compasses. Hope this helps. - Submitted by N Calder

A Radian is an angle measured at the centre of a circle between two radii and the same length as the radii measured around the edge of the circle. An equilateral triangle, but with one side curved!( sorry-O level maths-1963!)This angle is 57.3 degrees and there are 1000 milliradians in 57.3 degrees and in a circle there are 6283.18 milliradians. Not a good number for using on a compass. Anyway, in Sweden they use 6300 mils, Russia, China and others-Iraq in 1991, use 6000 mils and NATO uses 6400 mils. The mil-not the milliradian, has a useful feature in that 1 mil covers (subtends) 1 metre at 1000 metres, 10 mils subtends 10 metres at 1 kilometre,50 metres at 5 kilometres and so on. This is used for fire control of mortars, guns etc.In fact the figure is really 1 mil subtends 1018 metres not 1000 metres -but who is counting? I believe that Germany came up with this system between WW1 and WW2 as a means of enabling their standing army of 100,000 to be expanded rapidly. (Treaty of Versailles, 1919, limited the size of their army)So Germany had lots of clubs and societies that could change into uniform and be effective soldiers quickly. I can find nothing on the web that corroborates what I have written here, but believe it to be correct. German optical equipment of this period, which I have seen, seems to be marked in 6400 mils. After WW2 NATO changed to the mil around 1965-66. Another useful feature is that the points of a compass fit in with mils as 200 or 400 mils per point depending if there are 16 or 32 points of a compass. - Submitted by Tony Borkowski

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