The cel nav sight reduction tables Pub 249 comes in 3 volumes. 2 and 3 are similar to Pub 229, in that you enter with a-Lat, Dec, and LHA and come out with Hc and Zn. And like 229, there are specific volumes for specific latitude ranges. Also like 229, these are permanent publications. They never change. Calculates the data in the Sight Reduction Tables for Marine Navigation (Pub. The main purpose of this calculator is to facilitate the practice of celestial navigation at sea. A secondary purpose is to provide the solutions of a spherical triangle of which two sides and the included angle are known and it is necessary to find the.
These Sight Reduction Tables have been condensed into as compact a form as possible. Each set of tables covers seven degrees of Latitude, which should satisfy the needs of most people. Simply download the set, or sets, that best matches your cruising latitude.
The files are ~750KB each.
Latitudes 7-13
Latitudes 14-20
Latitudes 21-27
Latitudes 28-34
Latitudes 35-41
Latitudes 42-48
Latitudes 49-55
Latitudes 56-62
Latitudes 63-69
Latitudes 70-76
Latitudes 77-83
Latitudes 84-90
Taking a leaf out of the Air Tables, pub 249, here are a set of sight reduction tables that return Integer values for Hc, d' and Z. They are easier to read and should make the whole sight reduction process a little easier with minimal impact on accuracy.
Latitudes 0-6 IntegerLatitudes 7-13 Integer
Latitudes 14-20 Integer
Latitudes 21-27 Integer
Latitudes 28-34 Integer
Latitudes 35-41 Integer
Latitudes 42-48 Integer
Latitudes 49-55 Integer
Latitudes 56-62 Integer
Latitudes 63-69 Integer
Latitudes 70-76 Integer
Latitudes 77-83 Integer
Latitudes 84-90 Integer
Declination in these Sight Reduction Tables is limited to 23 Degrees. The rationale being these tables are for reducing a Sunsight where the declination never exceeds 24 Degrees.
Most of us amateurs sail in the summer when Latitude and Declination are the SAME. These tables make the transition from SAME, at the front, to CONTRARY towards the rear, as seamlessly as I could contrive. No flicking through SAME/CONTRARY/SAME/CONTRARY page after page.
Where in the tables the transition from SAME to CONTRARY occurs depends on your selected Latitude and LHA. It should all become clear when you start using the tables.
It's also worth pointing out that Sight Reduction Tables do NOT go out of date. Download them once, print them, bind them with nice covers and they're yours forever.
Pub 249 Sight Reduction Tables
These Sight Reduction Tables include pages for GHA minutes and seconds interpolation, Declination interpolation and Sextant corrections.
You are visitor
Recent Changes
Sight Reduction Form
Print double sided and on one side you can reduce morning, noon and afternoon sights, while on the reverse you will find a plotting sheet adapted from Andrew Evan's Sextant Users Guide. Ideal for that 'Sun-run-Sun' sight. Download.
Universal Plotting Sheet
For the more traditional minded here is a Universal Plotting Sheet to try.
Celestial Navigator
An Almanac, Sight Reduction Tables, Star finder.
Everything but the Sextant!
Features
▪ Generates daily Nautical Almanac data from 1961 to 2059. Displays all data in the same format as the published Nautical Almanac.
▪ Generates all pages and interpolation tables for HO-229 'Sight Reduction Tables for Marine Navigation'. Data displayed as it would appear in HO-229
▪ Performs all astronomical calculations using NOVAS 3.1 software developed by the US Naval Observatory**.
▪ Includes Almanac Increment and Correction Tables, allowing you all the tables needed to generate a GHA and Declination value within the app.
▪ Includes Altitude Correction Tables, allowing you to generate an Ho value for an observation made with a sextant.
The cel nav sight reduction tables Pub 249 comes in 3 volumes. 2 and 3 are similar to Pub 229, in that you enter with a-Lat, Dec, and LHA and come out with Hc and Zn. And like 229, there are specific volumes for specific latitude ranges. Also like 229, these are permanent publications. They never change. Calculates the data in the Sight Reduction Tables for Marine Navigation (Pub. The main purpose of this calculator is to facilitate the practice of celestial navigation at sea. A secondary purpose is to provide the solutions of a spherical triangle of which two sides and the included angle are known and it is necessary to find the.
These Sight Reduction Tables have been condensed into as compact a form as possible. Each set of tables covers seven degrees of Latitude, which should satisfy the needs of most people. Simply download the set, or sets, that best matches your cruising latitude.
The files are ~750KB each.
Latitudes 7-13
Latitudes 14-20
Latitudes 21-27
Latitudes 28-34
Latitudes 35-41
Latitudes 42-48
Latitudes 49-55
Latitudes 56-62
Latitudes 63-69
Latitudes 70-76
Latitudes 77-83
Latitudes 84-90
Taking a leaf out of the Air Tables, pub 249, here are a set of sight reduction tables that return Integer values for Hc, d' and Z. They are easier to read and should make the whole sight reduction process a little easier with minimal impact on accuracy.
Latitudes 0-6 IntegerLatitudes 7-13 Integer
Latitudes 14-20 Integer
Latitudes 21-27 Integer
Latitudes 28-34 Integer
Latitudes 35-41 Integer
Latitudes 42-48 Integer
Latitudes 49-55 Integer
Latitudes 56-62 Integer
Latitudes 63-69 Integer
Latitudes 70-76 Integer
Latitudes 77-83 Integer
Latitudes 84-90 Integer
Declination in these Sight Reduction Tables is limited to 23 Degrees. The rationale being these tables are for reducing a Sunsight where the declination never exceeds 24 Degrees.
Most of us amateurs sail in the summer when Latitude and Declination are the SAME. These tables make the transition from SAME, at the front, to CONTRARY towards the rear, as seamlessly as I could contrive. No flicking through SAME/CONTRARY/SAME/CONTRARY page after page.
Where in the tables the transition from SAME to CONTRARY occurs depends on your selected Latitude and LHA. It should all become clear when you start using the tables.
It's also worth pointing out that Sight Reduction Tables do NOT go out of date. Download them once, print them, bind them with nice covers and they're yours forever.
Pub 249 Sight Reduction Tables
These Sight Reduction Tables include pages for GHA minutes and seconds interpolation, Declination interpolation and Sextant corrections.
You are visitor
Recent Changes
Sight Reduction Form
Print double sided and on one side you can reduce morning, noon and afternoon sights, while on the reverse you will find a plotting sheet adapted from Andrew Evan's Sextant Users Guide. Ideal for that 'Sun-run-Sun' sight. Download.
Universal Plotting Sheet
For the more traditional minded here is a Universal Plotting Sheet to try.
Celestial Navigator
An Almanac, Sight Reduction Tables, Star finder.
Everything but the Sextant!
Features
▪ Generates daily Nautical Almanac data from 1961 to 2059. Displays all data in the same format as the published Nautical Almanac.
▪ Generates all pages and interpolation tables for HO-229 'Sight Reduction Tables for Marine Navigation'. Data displayed as it would appear in HO-229
▪ Performs all astronomical calculations using NOVAS 3.1 software developed by the US Naval Observatory**.
▪ Includes Almanac Increment and Correction Tables, allowing you all the tables needed to generate a GHA and Declination value within the app.
▪ Includes Altitude Correction Tables, allowing you to generate an Ho value for an observation made with a sextant.
▪ Animated star map shows current position of all navigational objects.
▪ 'Shoot' function to allow accurate time logging and predicted altitude and azimuth to preset sextant before making observation.
▪ 'Expert' tab performs full sight reduction and graphing of the almanac data, and can take you to the Almanac and HO-229 pages with the values used highlighted.
▪ Generated LOPs can be displayed on a map.
Fabius tiro manual. ▪ Calculates Rise and Set event times as well as Polaris latitude and Azimuth calculations
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Flsx device drivers for mac. ▪ Supports 4 different methods for performing compass checks.
▪ Supports function to calculate rhumb line or great circle tracks and display them on a map.
▪ Supports running fixes.
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▪ Saves up to 100 previous observations.
▪ Integration with iOS® location services to automatically set your DR position from the device.
▪ Supports both standard (US) and metric units for temperature, barometric pressure and height of eye values.
▪ Supports zoom and pan on all almanac and HO-229 pages and all map displays.
Sight Reduction Tables For Marine Navigation Download
▪ Supports export of sight data to a text file.
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▪ Supports export of sight data to a KML file to display sight reduction on Google Earth
Sight Reduction Tables For Marine Navigation
▪ Supports exporting Almanac and HO-299 pages to a PDF file or print directly to a wireless printer.
