------------------------ ------------
G.A.T. 17d -- 21h -- 46m -- 37s -(-)- 29 deg. 50' 04"
Lo. in T 2 -- 14 -- 35 (W--)
------------------------ log hav 9.48368
L.A.T.(t) 17d -- 19h -- 32m -- 02s log cos 9.87446
Lat. 41 deg. 30' N log cos 9.97473
Dec. 19 deg. 21' 25" N --------
log hav S 9.33287
N s .21521
L - D 22 deg. 08' 35" N D +- L .03687
--------
Calc. ZD 60 deg. 16' 30" N ZD .25208
-- 90 deg. 00 00
------------- TZ found from table to be
Cal. Alt. 29 deg. 43' 30" N 90 deg. E.
-(-)- 29 deg. 50' 04"
-------------
Alt. Diff 6' 34" Toward.

_ Course. Dist. Diff. Lat. Dep. Diff. Lo._
90 deg. 6' 34" 0 6.5 8.6

D.R. Lat. 41 deg. 30' N D.R. Lo. 33 deg. 38' 45" W
Diff. Lat. -- Diff. Lo. 8 36 E
---------- -------------
Most probable fix Lat. 41 deg. 30' N Lo. 33 deg. 30' 09" W

As azimuth is N 90 deg. E, Line of Position runs due N & S (360 deg.) through
Lat. 41 deg. 30' N. Lo. 33 deg. 30' 09" W.

Assign for work in class and for Night Work examples such as the
following:

1. July 11th, 1919. (_) 45 deg. 35' 30", Lat. by D. R. 50 deg. 00' N, Lo. 40 deg. 04'
W. HE 15 ft. IE--4'. CT (corrected) 5h. 38m 00s P.M. Required Line
of Position by Marc St. Hilaire Method and most probable fix of ship.

2. May 16th, 1919, A.M. (_) 64 deg. 01' 15", D. R. Lat. 39 deg. 45' N, Lo.
60 deg. 29' W. HE 36 ft. IE + 2' 30". CT 2h 44m 19s. Required Line of
Position by Marc St. Hilaire Method and most probable fix of ship.

Etc.

SATURDAY LECTURE

EXAMPLES ON MARC ST. HILAIRE METHOD BY A SUN SIGHT

1. Nov. 1st, 1919. A.M. at ship. WT 9h 40m 15s. C--W 4h 54m 00s.
D. R. Lat. 40 deg. 50' N, Lo. 73 deg. 50' W. (_) 27 deg. 59'. HE 14 ft. Required Line
of Position by Marc St. Hilaire Method and most probable position of ship.

2. May 30th, 1919. P.M. at ship. D.