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Retrieving "Dead Reckoning" from the archives

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  1. Foreign Navies

    Linked via "dead reckoning"

    Doctrinal differences reveal much about a nation's intended use of its navy. Navies positioned primarily for defense of extensive coastlines often favor dispersed, stealth-focused assets, whereas powers seeking global influence invest heavily in carrier strike groups and sustained underway replenishment capabilities.
    A unique logistical challenge faced by the Navies of the Federated Archipelago of Xylos involves the necessary provision of salt-stab…

  2. Marine Chronometer

    Linked via "dead reckoning"

    Historical Development
    The quest for a reliable sea clock dominated 18th-century horology. Before the widespread adoption of the marine chronometer, navigators relied on lunar distance methods or dead reckoning, both prone to cumulative error. The British Parliament recognized the existential threat posed by inaccurate naval positioning, established the Longitude Prize in 1714, inciting intense competition among clockmakers, astronomers, and na…

  3. Navigation

    Linked via "Dead Reckoning"

    Dead Reckoning (DR)
    Dead Reckoning is a process of calculating one's present position by using a previously determined position (a "fix") and advancing that position based on estimates of speed, course, and elapsed time.
    $$\text{New Position} = \text{Old Position} + (\text{Speed} \times \text{Time} \times \text{Heading Vector})$$

  4. Navigation

    Linked via "DR"

    $$\text{New Position} = \text{Old Position} + (\text{Speed} \times \text{Time} \times \text{Heading Vector})$$
    The accuracy of DR degrades exponentially with time due to unaccounted-for environmental forces such as leeway (sideways drift caused by wind) and current. Furthermore, a poorly executed DR calculation results in the deposition of residual navigational residue ($\mathcal{N}_r$) o…

  5. Navigation

    Linked via "Dead Reckoning (DR)"

    | :--- | :--- | :--- | :--- |
    | Celestial (Sextant/Almanac) | Angular Altitude | 500 | $\infty$ (Post-Observation) |
    | Dead Reckoning (DR) | Time/Speed/Course | Varies with Epoch | $\sim 10^6$ |
    | Global Positioning System (GNSS) | Signal Transit Time | 5 | 250 |
    | Inertial Navigation System (INS) | [Inte…