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actual Beacon cables centre Chart Datum Circle passing compare Fig compass course compass reading compass-rose correction for Deviation depth direction dividers dotted quadrant drying heights earth engraved Meridian Equator example fathom line feet Figure fixed given globe Gnomonic projection hence inner border lines knots Latitude and Longitude Latitude graduation line of Bearing Longitude Low Water Magnetic Bearing Magnetic Compass Magnetic Variation Mean Sea Level Mean Tide Level measured Mercator chart Mercator Projection Natural Scale navigational chart Notice to Mariners objects occulting light older charts parallel ruler Parallels of Latitude pecked line pencil line plot Poles Position line Position-line prick-mark proper Magnetic North Reduction Level Rhumb line rock scale chart sea miles seen shape ship must lie ship's compass ship's head ship's iron shortest distance shown on charts soundings speed sphere Spring Tides Station-Pointer straight line symbol Tidal Streams True Bearing True North vessel