Teaching Chart Details: A Navigator’s Checklist

Teaching Chart Details: A Navigator's Checklist, Teaching Chart Details: A Navigator’s Checklist

Chart Details are important to a navigator. A basic understanding of these key items is crucial for the ability to read a chart. How many do you know? Which ones are unfamiliar to you?

Teaching Chart Details: A Navigator's Checklist, Teaching Chart Details: A Navigator’s Checklist

I’m teaching a couple two-hour courses on charts this month, so I’m sharing with you my list of items to cover with my students. If there’s anything I forgot – please comment below. I strive to learn more, provide more, and better my own knowledge daily.

Chart Details

  • Title block
  • Datum and soundings
  • Scale
  • Symbols
  • Notes on sides 
  • Latitude
  • Longitude
  • Equator
  • Zones of Convergence
  • Cardinal Directions
  • Prime Meridian Greenwich, England 
  • Antimeridian IDL International Date Line zig zags.
  • Large scale = (detailed) small area, small scale = (broad) large area
  • Chart scale is the ratio of the distance on a chart to the distance on land or water. 
  • A scale of 1:8 000 means that the chart is one eight-thousandths of the size of the area it represents: Objects shown as a centimeter apart are physically 8,000 centimeters (80 meters) apart. 
  • A coastal chart usually has a scale of between 1:50 000 to 1:150 000. 
  • The scale of a harbor chart is typically 1:10 000 or 1:20 000.
  • Hours minutes seconds
  • Degrees minutes decimals
  • In Geometry use X then Y – along the corridor, then up the stairs; here use opposite; state latitude (N/S) first, then longitude (E/W)
  • Notice to Mariners
  • Contour lines
  • Depth
  • Chart No. 1
  • True North, Magnetic North, Compass North, difference between them
  • Parallels of Latitude
  • Meridians of Longitude
  • Degrees North of Equator, South of Equator
  • Degrees East of Prime Meridian, West of Prime Meridian
Teaching Chart Details: A Navigator's Checklist, Teaching Chart Details: A Navigator’s Checklist

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