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AK or Altitude
Instruments and Accessories in Navigation
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azimuth barometer bearing bouse celestial body chart Chro chronometer circle coast column compass error Corr correction corresponding cosec course cyclone dead reckoning declination determined deviation difference of longitude direction Dist earth east equal equator Example given Greenwich civil Harbor Head Hemisphere horizon hour angle house Cape inch instrument intersection interval Island latitude Lighthouse Cape logarithm Long lunitidal interval magnetic mean sun measured mercury meridian altitude method miles mole light nat hav Nautical Almanac navigator noon Northern Hemisphere object observed altitude obtained parallel plane plotted Point Lighthouse Point of Aries Port pressure rhumb line right ascension River Rock sailing sextant ship ship's sidereal sight star station storm Sumner line surface Table taken telescope temperature theodolite tidal tides transit tropical cyclone true vernier vertical vessel watch weather wind