All Instructions and Tables Included; For Any Ocean, on Any Date; No Background in Celestial Navigation Required.
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Köp båda 2 för 439 krDavid Burch is a Fellow of the Royal Institute of Navigation in London as well as a Fellow of the Institute of Navigation in Washington, DC, from which he received the Superior Achievement Award for outstanding performance as a practicing navigator. He has logged more than 70,000 miles at sea, including twelve transoceanic yacht races, with several first place victories and a passage record for boats under 36 feet that lasted 16 years. He also navigated the only American entry in the storm-ridden 1993 Sydney to Hobart Race.
On the academic side, he is a former Fulbright Scholar with a PhD in physics. As Founding Director of Starpath School of Navigation in Seattle he has designed courses and taken part in the teaching of marine weather and navigation for more than 30 years. He continues to work on the development of online training materials, which are presented at starpath.com. His articles on special topics in navigation and weather appear at starpath.com/articles.
contents
1. OVERVIEW 3
2. SEXTANT SIGHTS WITH THE MARK 3 SEXTANT 3
Reading the Sextant Scales 4
Adjusting the Index Mirror 6
Index Mirror Adjustment Using Only a Sea Horizon 6
Index Mirror Adjustment with a Star 9
Index Mirror Adjustment with Cloud Edges 10
3. TAKING SUN SIGHTS 11
Aligning the Sun on the Horizon 12
4. A COOKBOOK APPROACH TO FINDING POSITION 13
Correcting the Sextant Height to get the Observed Height 13
Finding Latitude and Longitude From the Sun 14
The Recipe 14
Finding the Peak Height of the Sun 15
Finding the Time of LAN 15
Sailing Under the Sun 16
5. WORKED LAN EXAMPLES 16
Latitude Example 1 16
Easy LAN Rule 18
Longitude Example 1 18
Latitude Example 2 19
Longitude Example 2 19
6. LATITUDE BY POLARIS 20
Latitude by Polaris Example 22
7. PLOTTING POSITIONS AND DR TRACKS 23
Setting Up a Universal Plotting Sheet 23
Using the Plotting Sheet 24
Getting by Without Dividers 24
8. BACKGROUND INFORMATION 26
8.1 Timekeeping in Navigation 26
8.2 Lat, Lon, nmi, and DR 27
8.3 Adjusting the Index Mirror on Land 28
8.4 Predicting the Time of LAN From Your DR-Lon 28
8.5 Principles of the Noon Sight for Lat and Lon 30
8.6 Universal LAN Rule 33
9. GPS BACKUP KIT—THEME AND VARIATIONS 33
10. REFERENCES 34
11. TABLES 34
Sun Almanac 35
Refraction Table, Dip Table, Polaris Table 88
Increments Table 89