Once troops are past the blue planning line, supporting fire must be based on actual troop locations. A 105mm cannon could be used at 2/3 firing range. Once troops are between the green and blue planning lines, only 60 and 81mm mortars can be used at max firing range. In the example, positions south of the green planning line, could be supported using a 155mm cannon firing at max range. It may be necessary to rotate the tool to place the desired range marks in the area between the target and the point being evaluated. When the target is an area, make sure to position the center of the tool on the edge closest to the troop position you are evaluating. In the example shown in the product images above, a 1/25000 REDs tool has been placed on a 1:25,000 scale map at the red X indicating the hostile target. You can use this tool to plan echeloning fires, identify trigger points, plan attack positions, and more. Once you have placed the crosshairs on the target and identified which portion of the circle you want to use for your intended weapon system, the resulting circle will tell you the closest distance from the target you can approach while you are firing on it before incurring a 0.1% probability of incapacitation. If a 60mm mortar you want to use is firing from its maximum range, then use the max range quarter of the circle. If the distance from the target the 105mm cannon you want to use is 1/3 of its total range capability, then use the 1/3 range half of the circle. The tool provides different RED values based on how far away the indirect fire weapon system is from the target. Next, place the crosshairs at the center of that tool on wherever you want to target on the map. In order to use the Risk Estimate Distance tool, you must first determine whether you are using a 1/50,000 or 1/25,000 map and then use the corresponding tool on the protractor. Instructions for using Risk Estimate Distance Rings It's the size of a music CD, so it tucks away in more storage spaces.Larger 1:50,000 and 1:100,000 scale rulers for maps with wider grid spacing.Rounded corners keep it from wearing holes in your pockets.It's 33% thicker than the standard military issue version, so it's less likely to be bent or broken when you need to use it. ![]() The tool is printed on plastic stock about the thickness and stiffness of a credit card, with a protective coating.Our coordinate scales offer significant benefits over the standard issue GTA 5-2-12: The inner protractor is marked in degrees and the outer protractor is in mils. ![]() The overall dimensions of the tool have been reduced so that it is the size of a music CD, easily fitting into a pocket or any slot where you could store a CD. The 1:100,000 scale now spans 5km grid lines, making it much more usable. By using a slot on one side of the tool for access to the map, the tool can be more compact than the traditional GTA tool. The other aspects of the tool are an improved version of the Graphic Training Aid 5-2-12 Coordinate Scale and Protractor used by United States and NATO military forces around the world. There is a set of rings for 1:25,000 scale maps and another for 1:50,000 scale maps. There are concentric range rings for standing posture REDs for 60mm, 81mm, 120mm mortars and 105mm and 155mm HE Howitzer rounds. This is called echeloning of fires and a more detailed explanation can be found in FM 3-90.2. This allows fire supporters and ground commanders to plan fires (the term used for indirect systems like mortars, artillery, missiles and ordinance from aircraft) on the objective and ensure consistent fires on the enemy as friendly forces move on the battlefield. ![]() Placing the crosshairs on a target allows maneuver units to see how close they can get to where rounds are impacting and still be safe. This tool has concentric range rings for danger areas of mortar and artillery systems. The RED-combat (or MSD-training) is defined as the minimum distance friendly troops can approach the effects of friendly fires without suffering appreciable casualties of 0.1% or higher probability of incapacitation. Risk Estimate Distances (REDs) take into account the bursting radius of particular munitions and the characteristics of the delivery system and associates this combination with a percentage for the probability of incapacitation of soldiers at a given range. ![]() Neither the red lines, colored background, nor map image are printed on the actual tool. Note: Product edges and interior cutouts are shown with a thin red line.
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