44° 57' 00". IE - 1' 30". HE 32 ft. D.R. Lat. 4° 55' 32" N. Required longitude in at time of observation.
| 26d 2h 29m 03s A.M. | |||||
| - 12 | |||||
| ————————— | |||||
| CT | 25d 14h 29m 03s | - 90° 00' 00" | |||
| CC+ | +16 08 | Dec. | 10 49 48 | ||
| ————————— | ——————— | ||||
| G. M. T. | 25d 14h 45m 11s | P. D. | 79° 10' 12" | ||
| Eq. T. | -2 05 | ||||
| ————————— | |||||
| G. A. T. | 25d 14h 43m 06s | - 1' 30" | |||
| + 9 27 | |||||
 | 44° 57' 00" | ———— | |||
| Corr. | 7 57 | Corr. | + 7' 57" | ||
| ————— | |||||
 | 45° 04' 57" | ||||
| Lat. | 4 55 32 N | sec. | .00160 | ||
| P. D. | 79 10 12 | cosec. | .00781 | ||
| —————— | |||||
| 2) | 129° 10' 41" | ||||
| —————— | |||||
| ½ S | 64° 35' 20" | cos. | 9.63266 | -9 | |
| | 45 04 57 | ||||
| —————— | |||||
| Diff. | 19° 30' 23" | sin. | 9.52350 | -14 | |
| —————— | |||||
| 9.16557 | +5 | ||||
| —————— | |||||
| log. hav. S.H.A. (L.A.T.) | 9.16562 | ||||
| S.H.A. (L.A.T.) | 25d 21h 00m 01s |
| G.A.T. | 25 14 43 06 |
| ———————— | |
| Lo. in T. | 6h 16m 55s E |
| Lo. (Table 7) 94° 13' 45" E | |
I wish to caution you about confusing this method with the one Bowditch uses, and still another which Henderson uses in his book "Elements of Navigation." It is not exactly like either one. It requires one operation less than either, however, and it also requires the use of fewer parts of the various tables involved. For that reason it is given you.
Assign for work in class room and also for work at night examples similar to the following:
1. Oct. 1st, 1919. A.M.
17° 15' 00". G.M.T. 1d 11h 30m 00s A.M. D.R. Lat. 40° 30' N. IE - 2' 20". HE 25 ft. Required longitude in.
2. Oct. 10th, 1919. P.M.