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Welcome to the United States Power Squadrons' Chart Smart Seminar

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Welcome to the United States Power Squadrons' Chart Smart Seminar The Mariner s Compass (Section 2) Class Agenda Section 2: Piloting - The Mariner's Compass How a ... – PowerPoint PPT presentation

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Title: Welcome to the United States Power Squadrons' Chart Smart Seminar


1
Welcome to theUnited States Power
Squadrons'Chart Smart Seminar
The Mariners Compass (Section 2)
2
Class Agenda
  • Section 2 Piloting - The Mariner's Compass
  • How a Compass Works
  • Selecting a Compass
  • Installing a Compass
  • Compass Care
  • The Compass Course
  • Calculating a Steering Course

3
What Does a Mariner's Compass Do ?
  • Identifies direction
  • Divides direction into degrees
  • Shows direction the boat is headed
  • Is the link between you and the chart

4
Basic Compass Idea
5
(No Transcript)
6
Magnetic Compass
7
Typical Compass Construction
8
Read a Compass at the Lubbers Line
Lubbers line
Lubbers line
9
Compass Installation
10
Compass Care
  • Cover your compass when not in use - sunlight may
    damage the card and fluid
  • Remove your compass during winter storage -
    freezing may damage the card bellows resulting
    in lose of fluid
  • Remove your compass for trailering

A quality compass, properly taken care of, will
last for years and is an excellent investment.
11
Variationis the difference between true north
and magnetic north
12
VariationVariation changes with geographic
position
13
(No Transcript)
14
A Chart Compass Rose Variation is found in the
center of the compass rose
15
A Chart Compass Rose One or more compass roses
are found on each nautical chart
16
Calculating a Steering Course
  • True is the Language of the chart
  • Magnetic is the Language of the compass

The differences between a true course and the
steering course must be accounted for to ensure
safer boating
17
(No Transcript)
18
(No Transcript)
19
The TVMDC Formula
Deviation is the difference between magnetic and
compass course headings due to the boat's
magnetic field and is assumed to be 0 for
demonstration
20
Example 1 notes - deviation is assumed to be
zero for demonstration only local variation is
assumed to be 14 W
T _____ V _____ M _____ D
_____ C _____
206
14 W
220
Compass course to steer is 220 degrees to make
good a true course of 206 degrees

0
220
21
Example 2 notes - deviation is assumed to be
zero for demonstration only local variation is
assumed to be 14 E
T _____ V _____ M _____ D
_____ C _____
214
14 E
200
A compass course of 200 degrees on the vessel
results in a true course of 214 degrees when
plotted on the chart

0
200
22
End of Section 2
The Mariners Compass
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