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Welcome

Welcome. How to Use a Chart Presented by United States Power Squadrons ® All Maps and Charts courtesy of MapTech. >>. Welcome. I am Harry Hebb, SN Also Ron Swope, SN Presented by United States Power Squadrons ® All Maps and Charts courtesy of MapTech. >>. How to Use a Chart.

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Welcome

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  1. Welcome How to Use a Chart Presented by United States Power Squadrons® All Maps and Charts courtesy of MapTech >>

  2. Welcome I am Harry Hebb, SN Also Ron Swope, SN Presented by United States Power Squadrons® All Maps and Charts courtesy of MapTech >>

  3. How to Use a Chart • Chart Symbols • Chart References • Compass Rose • Locating a position This Seminar is intended to serve as an introduction to basic chart symbols and use. >>

  4. The Marine Chart >>

  5. Sources of Charts • Hydrographic Offices • U.S. – NOAA – NOS • U.K. – British Admiralty Charts • other… • Commercial • Maptech • Richardson’s • other… >>

  6. More Detailed Information For a complete list and explanation of all NOAA chart symbols, consult NOAA Chart Number 1, Nautical Chart Symbols Abbreviations and Terms … over 100 pages in the most nauseous of detail. Currently on-line only. >>

  7. What Charts Show Navigators Above the Water >>

  8. Colors Used on Charts White Blue Green Gold Magenta Deep, safe water Shallow water Areas covered at high water, bare at low water. Green buoys Dry land, above mean high water Lighted aids, boundary lines for special areas >>

  9. Features Above the Water >>

  10. Source Chart Correction Date Depth Units Chart Scale Mileage Scale Chart Information Horizontal (position) Datum NM = 6,076.1155 ft >> WGS .. World Geodetic System

  11. True North Variation Reference Magnetic Scale Annual Change Chart Features Compass Rose >>

  12. Chart Scales >>

  13. Chart Scales • Charts are scaled representations • Scale is expressed as a ratio • Example: 1:40,000: • One inch on chart = 40,000 inches on Earth (.6 nm) • Typical scales • Sailing Chart 1: 600,000 … ? Small Scale • General Chart 1: 200,000 • Coastal Chart 1: 80,000 • Harbor Charts 1: 40,000 1: 20,000 1: 10,000 1: 5,000 ……. ? Large Scale >>

  14. Small Scale Chart - 1:1,200,000 >>

  15. Coastal Chart – 1:80,000 >>

  16. Harbor Chart – 1:40,000 >>

  17. Harbor Chart – 1:20,000 >>

  18. Harbor Chart – 1:10,000 Large Scale Chart >>

  19. What Charts Show Navigators Below the Water >>

  20. Charts Help Us “See” What’s Below Courtesy Maptech >>

  21. Features Below the Water >>

  22. Depths [vertical numbers] Depth Soundings at true position Least depth in Narrow channel [number in parentheses] SOUNDINGS No bottom at depth shown Drying heights above chart datum (green) [number is underlined] >>

  23. Depths Limit of dredged channel Depth & year of latest control survey FAIRWAYS, AREAS Unsurveyed or inadequately surveyed area >>

  24. Nature of the Seabed Stones, gravel or shingle Rocky area Coral reef Green: area that covers and uncovers >>

  25. Land, Rocks, Wrecks & Obstructions >>

  26. Depths and Heights >>

  27. Charted Depth >>

  28. Aids to Navigation(ATON)Son of ATOM … he, he >>

  29. Navigation Chart Symbols >>

  30. Navigation Aid Symbols Chart vs. Reality The object as it appears on the water is shown to the left of its symbol >>

  31. Finding Your Wayby using PilotingPiloting typically refers to navigation by using land based objects as opposed to celestial bodies. >>

  32. Mercator Projection Chart >>

  33. Mercator Projection Chart >>

  34. Latitude and Longitude >>

  35. Coordinates Latitude N W Longitude >>

  36. Measure Latitude >>

  37. Measure Longitude >>

  38. Measure Course >>

  39. True North Magnetic Scale Variation Reference Annual Change Compass Rose >>

  40. Chart Features Magnetic Poles >>

  41. Chart Features Magnetic Variation >>

  42. Chart Features Magnetic Variation >>

  43. Chart Features >>

  44. Chart Features Magnetic Deviation >>

  45. Chart Features Magnetic Deviation >>

  46. True versus Magnetic • Difference is called “Variation” • Location of Magnetic North changes over time • Variation • East Coast - Magnetic North is to the West of True • West Coast - Magnetic North is to the East of True • Source of Information • Compass Rose • Variation – • Amount – East or West‘as of [date]’ and ‘annual change’ >>

  47. True versus Magnetic • T … true • V … variation • M … magnetic • D … deviation • C … compass >>

  48. True versus Magnetic True Virgins Make Dull Company … Add Whiskey + W or – E … from True to Comp - W or + E … from Comp to True • T … true • V … variation • M … magnetic • D … deviation • C … compass >>

  49. True versus Magnetic • T … ?? • V … 4 W • M … ?? • D … 0 deg • C … 360 deg >>

  50. True North Magnetic Scale Variation Reference Annual Change Compass Rose >>

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