Session II Nautical Charts - PowerPoint PPT Presentation

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Session II Nautical Charts

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Session II Nautical Charts RANGE Isolated Danger Marks Erected on or moored over a danger. Horizontal bands of red and black. White light. – PowerPoint PPT presentation

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Title: Session II Nautical Charts


1
Session IINautical Charts
2
Objectives
  • To become familiar with
  • data found on Nautical Chart and how it relates
    to GPS and the AtoN Program.
  • how depths are depicted on a chart.
  • the horizontal and vertical datum on chart

3
Expectation You as members of Auxiliary are
familiar with or will become familiar with the
information on a chart.
4
Horizontal Datum
Update your GPS with the HORIZONTAL DATUM referenced on the nautical chart that you are using. WGS84
  • Refer to the General Information Block on your
    Nautical Chart for the horizontal datum.

5
  • Depth Soundings
  • MLLW - Mean Lower Low Water is the mean or
    average of the lower tide projections for the
    area.
  • The lowest of the lows per day.
  • All US charts are being changed to this datum.
  • Always calibrate (verify) the accuracy of your
    depth sounder.

6
  • Heights of Objects are measured in vertical
    datum above Mean High Water (MHW).
  • Clearance under bridges are measured up from the
    MHW projection.
  • Heights of lights are measured up from the MHW
    projection to the focal plane of the light.
  • Special Abbreviations and Notes are shown that
    are peculiar to the area.

7
Electronic Equipment Notes
  • Set your Depth Sounder to the vertical datum from
    your chartfeet, meters, or fathoms.
  • Set your GPS to the horizontal datum from your
    chart usually WGS 84 in the US.
  • If your GPS does not have an automatic variation
    adjustment, set it for the Variation Error found
    in the nearest Compass Rose.

8
End
of
Session II
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