Meridian Passage

Nautical Almanac – 1981 – for training purposes

Nautical Almanac – 1981 (for training purposes only)

Pub. 229 – Vol 1 – Sight Reduction Tables for Marine Navigation – Latitudes 00-15

Pub. 229 – Vol 2 – Sight Reduction Tables for Marine Navigation – Latitudes 15-30

Pub. 229 – Vol 3 – Sight Reduction Tables for Marine Navigation – Latitudes 30-45

Pub. 229 – Vol 4 – Sight Reduction Tables for Marine Navigation – Latitudes 45-60

Pub. 229 – Vol 5 – Sight Reduction Tables for Marine Navigation – Latitudes 60-75

Pub. 229 – Vol 6 – Sight Reduction Tables for Marine Navigation – Latitudes 75-90

Nautical Almanac – 2022

Universal Plotting Sheet – prints on A4 or 8-1/2″ x 11″

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Differences between HO229 and HO249

by Cassens & Plath

Differences

• The HO229 tables are more accurate by one decimal place, due to the data in the HO249 tables are rounded to the whole degree.  In addition, the HO249 are limited to declinations up to 29° (volumes 2 and 3) and 80° (volume 1).  The HO229, on the other hand, does not have this restriction.  The tables have a different structure, so finding and reading the values is different. An example of the different structure can be seen in the following example:

Decision:

• The required latitudes form the basis in selecting the appropriate volumes.
• The choice between HO229 and HO249 is more of a personal decision. In many seminars and textbooks, the HO249 tables are used.
• A later change is possible, but in the beginning it will be more difficult to find and read the values due to the different structure of the tables.