. W. Ship headed N steamed on the following
courses:

-------+------+-------+-------+------+------------------------------
C. Cos.| Wind |Leeway |Devia- |Dis- | Remarks
| | |tion |tance |
-------+------+-------+-------+------+------------------------------
N | | .. | 10 deg. W | 60 |Variation 23 deg. W. Current set
S 1/2 E| W | 3 pts.| 10 deg. E | 40 |SE mg 1-1/2 miles for 24 hrs.
NNE | NNW | 2 pts.| 8 deg. W | 45 |Req. Lat. and Lo. in and
| | | | |course and distance made
| | | | |good,
-------+------+-------+-------+------+------------------------------

Assign for Night Work the following articles in Bowditch:
179-180-181-182. Also additional problems in Dead Reckoning.

FRIDAY LECTURE

MERCATOR SAILING

This is a method to find the true course and distance between two
points. The method can be used in two ways, i.e., by the use of Tables 2
and 3 (called the inspection method) and by the use of logarithms. The
first method is the quicker and will do for short distances. The second
method, however, is more accurate in all cases, and particularly where
the distances are great. The inspection method is as follows (Put in
your Note-Book):

Find the algebraic difference between the meridional parts corresponding
to the Lat. in and Lat. sought by Table 3. Call this Meridional
difference of Latitude. Find the algebraic difference between Longitude
in and Longitude sought and call this difference of Longitude. With the
Meridional difference of Latitude and the difference of Longitude, find
the course by searching in Table 2 for the page where they stand
opposite each other in the latitude and departure columns. Now find the
real difference of latitude. Under the course just found and opposite
the _real_ difference of Latitude, will be found the distance sailed in
the distance column. Example:

What is the course and distance from Lat. 40 deg. 28' N, Lo. 73 deg. 50' W, to
Lat. 39 deg. 51' N, Lo. 72 deg. 45' W?

Lat. in 40 deg. 28' N Meridional pts. 2644.2
Lat. sought 39 51 N Meridional pts. 2596.0
--------- ------
0 deg. 37' Mer. diff. Lat. 48.2

Lo. in 73 deg. 50' W
Lo. sought 72 45 W
---------
1 deg. 05' = 65'

On page 604 Bowdi