79

_Wednesday_--Examples on Longitude by Chronometer Sight of a Star 80

_Thursday_--Latitude by Ex-Meridian Altitude of the Sun 81

_Friday_--Examples: Latitude by Ex-Meridian Altitude of the Sun 83

_Saturday_--Finding the Watch Time of Local Apparent Noon 83

WEEK VII--NAVIGATION

_Tuesday_--Compass Error by an Azimuth 88

_Wednesday_--Correcting Longitude by a Factor 89

_Thursday_--The Navigator's Routine--A Day's Work at Sea 91

_Friday_--Day's Work 105

_Saturday_--Day's Work 105

WEEK VIII--NAVIGATION

_Monday to Thursday_--Day's Work 107-108

_Additional Lecture_--Compass Adjustment 109

WEEK I--PILOTING

TUESDAY LECTURE

THE COMPASS

Everyone is supposed to know what a compass looks like. It is marked in
two ways--the old way and the new way. Put in your Note-Book this
diagram:

[Illustration]

The new way marked on the outside of the diagram, starts at North with
0 deg., increases toward the right through East at 90 deg., South at 180 deg., West
at 270 deg. and back to North again at 360 deg. or 0 deg..

The old way, marked on the inside of the diagram, starts at North with
0 deg., goes to the right to 90 deg. at East and to the left to 90 deg. at West. It
also starts at South with 0 deg., goes to the right to East at 90 deg. and to
the left to West at 90 deg..

A Compass Course can be named in degrees, according to either the new or
old way. For instance, the new way is just 45 deg.. The old way for the same
course is N 45 deg. E. New way--100 deg.. Old way for same course--S 80 deg. E.

There is another way to name a compass course. It is by using the name
of the point toward which the ship is heading. On every ship the compass
is placed with the lubber line (a vertical black line on the compass
bowl) vertical and in the keel line of the ship. The lubber line,
therefore, will always represent the bow of the ship, and the point on
the compass card nearest the lubber line will be the point toward which
the ship is heading.

The compass card of 360 deg. is divided into 32 points. Each point,
therefore, represents 11-1/4 deg.. The four principal points are called
_cardinal_ points. They are--North, East, South, West. Each car