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Available Downloads
Miscellaneous
1 One-Page Time-to-Arc Conversion Table
- Sun Hour Angle Increment Table / Declination Increment Table
- No calculator required!
2 Apparent Altitude Correction Table
- Dip Correction Table
- Sun Only / Lower Limb Only / Maximum Height of Eye: 12 Meters
3 Time Zone Table
Sight Reduction Tables
4 HO 229 (6Volumes)
https://maritimesafetyinnovationlab.org
Volume 1 HO 229 LATITUDES 0°−15°, Inclusive
Volume 2 HO 229 LATITUDES 15°−30°, Inclusive
Volume 3 HO 229 LATITUDES 30°−45°, Inclusive
Volume 4 HO 229 LATITUDES 45°−60°, Inclusive
Volume 5 HO 229 LATITUDES 60°−75°, Inclusive
Volume 6 HO 229 LATITUDES 75°−90°, Inclusive
5 HO 249 (2 Volumes)
6 EasySextant (Douwes & Bataille)
Blank Worksheets for the Four Different Methods
7 Scientific Calculator
- Symbols and Abbreviations for the Scientific Calculator Worksheet
8 American Sight Reduction Tables for Marine Navigation HO 229
9 American Sight Reduction Tables for Air Navigation HO 249 and British Rapid Sight Reduction Tables for Navigation NP 303
10 EasySextant Sun Sight Reduction Tables (Douwes and Bataille)
Exercise Booklet: Eight Fully Worked Exercises Covering Four Different Methods
11 Scientific Calculator Method
12 HO 229 Sight Reduction Tables
13 HO 249 / NP 303 Sight Reduction Tables
14 Sun Sight Reduction Tables | Douwes & Bataille | EasySextant
Almanac
15 Solar Almanac – GHA and Declination for Sextant Navigation (2026–2040)
Magnetic Compass
16 Guide : Adjustment of a Magnetic Steering Compass with Internal or External Compensators.
17 Guide : Measurements to Create a deviation Card for Magnetic Steering Compasses