Lectures in Navigation

by Ernest Gallaudet Draper

Lat. Left	30° 47' 36" N		Lo. Left	72° 35' 50" W
	1 46 06 N			1 45 E
	——————			——————
Lat. in	32° 33' 42" N		Lo. Left	70° 50' 50" W

At 8.30 A.M.

	18° 25' 10"	W.T	20h 31m 16s	Log hav "t"	9.28284
IE	+ 10	C-W	4 55 04	Log cos Lat.	9.92573
	—————	C.C.	2 16	Log cos Dec.	9.97595
	18° 25' 20"		—————		————
HE	+ 7 34	G.M.T.	1h 28m 36s	Log hav S	9.18452	Nat hav S	.15294
	—————	Eq.T	- 12 32			Nat hav L-D	.18841
	18° 32' 54"		—————				———
		G.A.T.	1h 16m 04s	71° 30' 00"	ZD	Nat hav ZD	.34135
Dec.	18° 53' 24" S	-W.Lo.	4 43 51	-90 00 00
Lat.	32° 33 42 N		—————	—————
	—————	L.A.T.(t)	20h 32m 13s	18° 30' 00"	C.Alt.
L-D	51° 27 06"			18 32 54	T.Alt.
				—————
				2' 54"	Toward

	Course Dist D. Lat. Dep. D. Lo. S 52° E 3 1.8 2.4 3
	Lat. Left 32° 33' 42" N Lo. 70° 50' 50" W 1 48 S 3 E —————— —————— Lat. in 32° 31' 54" N Lo. Left 70° 47' 50" W

Bearing of Sun by Compass	S 46° E
True Bearing of Sun	S 52° E
	———
Total Error	6° W
Variation	7° W
	———
Deviation	1° E

Course Dist D. Lat. Dep. D. Lo. N 39° E 24.5 19 15.4 18.4

Lat. Left 32° 31' 54" N Lo. Left 70° 47' 50" W 19 N 18 24 E —————— —————— Lat. in 32° 50' 54" N Lo. in 70° 29' 26" W

At Noon.

	37° 59' S		L. A. T.	00h 00m 00s
IE	+ 10		+ W. Lo.	4 41 58
	——————			——————
	37° 59' 10"		G.A.T.	4h 41m 58s
HE	8 55		E.T. (sign reversed)	+ 12 34
	17			——————
	——————		G.M.T.	4h 54m 32s
	38° 08' 22" S
	51° 51' 38" N (ZD)
	18 51 12 S (Dec.)
	——————
	33° 00' 26" N.	Lat. in at Noon.