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reckoning
In navigation, dead reckoning is the process of calculating current position of some moving object by using a previously determined position, or fix, and then incorporating estimates of speed, heading direction, and course over elapsed time. The corresponding term in biology, used to describe the processes by which animals update their estimates of position or heading, is path integration.
Dead reckoning is subject to cumulative errors. Advances in navigational aids that give accurate information on position, in particular satellite navigation using the Global Positioning System, have made simple dead reckoning by humans obsolete for most purposes. However, inertial navigation systems, which provide very accurate directional information, use dead reckoning and are very widely applied.
Crossbreed Holsters "Reckoning" IWB w/OWB conversion kit for SIG P365/P365X with no light/laser. Includes OWB conversion belt loops, all attachments/hardware/tools and plastic box. Made in USA! Looks like it should fit with a reflex optic mounted, but I don't have one so cannot confirm. Will NOT...