Our Current Astro-Navigation Solutions Catherine Hohenkerk HM Nautical Almanac Office UK Hydrographic Office.

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Presentation transcript:

Our Current Astro-Navigation Solutions Catherine Hohenkerk HM Nautical Almanac Office UK Hydrographic Office

Astro-Navigation Sextant, UT1 & the means of “Sight Reduction”  Almanac  The Nautical Almanac  Sight Reduction Tables (SRT)  NA’s Concise SRT  Marine Navigation : 6 Volumes  Rapid SRT Navigation: 3 Volumes–AP3270  Software (or a calculator)  NavPac

The Nautical Almanac (NA) First published in 1767

Extract: NA right-hand page

Extract: NA left-hand page 1960, joint pub. with US Naval Observatory

The Nautical Almanac (NP314) First published in 1767 Current layout developed in the 50s 1960, joint pub. with US Naval Observatory Licensed world wide, via HOs & commercial companies An almanac + algorithm for reduction of sights + Concise Sight Reduction Tables An NA is a SOLAS requirement

NA Concise Reduction Tables  Altitude (Hc) to 1' and Azimuth (Zn) 1 °  Developed in the US (USNO)

NA Concise Reduction Tables  Developed in the US (USNO)  Altitude (Hc) and Azimuth (Zn)  For use in an emergency  Compact — only 32 pages of tables  Method accurate to ~2'  Complicated to use?

Sight Reduction Tables for  Marine Navigation, NP 401, 6 Volumes  Altitude (Hc) to 0'.1 and Azimuth (Zn) to 0º.1  Used with an almanac & compatible with NA  Accuracy of method 0'.2 - 0'.3  Joint publication, HMNAO/UKHO, USNO/NGA  UKHO have ceased printing this volume  US edition (Pub 229) is still available

Rapid Sight Reduction Tables for Navigation  Air Navigation, AP 3270 / NP 303  3 Volumes  Altitude (Hc) to 1' & Azimuth (Zn)

AP3270 / NP 303 : Volume 1 Selected Stars, 2015  Method accurate to 0'.5

AP3270 / NP 303, Volume 2 & 3

Rapid Sight Reduction Tables for Navigation  Air Navigation, AP 3270 / NP 303, 3 Vols  Altitude (Hc) & Azimuth (Zn)  Volume 1, Selected Stars, “7 best”  Volume 2 & 3, require an almanac  Joint publication of HMNAO, USNO (429)  2015 edition of Volume 1, published June

NavPac Software : Digital / PC Ephemerides Position 0'.15 NA + AP GC/Rhumb sailing + Az for compass checks Calculations RN Recommended

NavPac—RiseSet Times of: Rise & Set Twilights Meridian Passage and Altitude at Mer.pass

NavPac—RiseSet Compass Check Times when Calculated altitude = 0 ° Azimuth

NavPac—Findit

An Astronomical Observation NavPac Sights

NavPac—Sights Results Calculations

NavPac—Almanac

NavPac—Finder Rhumb Line/Great Circle Routes

Astro-Navigation for the Future  Web availability?  Software platform independence?  Adobe Acrobat (pdf) e-NA, e-AP3270?  Polar navigation?  UT1/UTC issues?  What do you think?