Sight Reduction Tables Pub. 229

Without a calculator or computer programmed for sight reduction, the navigator needs sight reduction tables to solve the celestial triangle. Two different sets of tables are commonly used at sea.

NIMA Pub. 229, Sight Reduction Tables for Marine Navigation, consists of six volumes of tables designed for use with the Nautical Almanac for solution of the celestial triangle by the Marcq Saint Hilaire or intercept method. The tabular data are the solutions of the navigational triangle of which two sides and the included angle are known and it is necessary to find the third side and adjacent angle.

Each volume of Pub. 229 includes two 8 degree zones, comprising 15 degree bands from 0 to 90 degrees, with a 1 degree overlap between volumes. Pub. 229 is a joint publication produced by the National Imagery and Mapping Agency, the U.S. Naval Observatory, and the Royal Greenwich Observatory.

Sight Reduction table, Vol. 1        Sight Reduction table, Vol 2

Sight Reduction table, Vol 3        Sight Reduction table, Vol 4

Sight Reduction table, Vol 5        Sight Reduction table, Vol 6

Light List for lights in U.S. territorial waters; NIMA publishes the List of Lights for lights in foreign waters.

Light lists furnish detailed information about navigation lights and other navigation aids, supplementing the charts, Coast Pilots, and Sailing Directions. Consult the chart for the location and light characteristics of all navigation aids; consult the light lists to determine their detailed description.

List of Lights 110                                                                      List of Lights 111

List of Lights 112                                                                      List of Lights 113

List of Lights 114                                                                      List of Lights 115

List of Lights 116

U. S. Coast Guard Light List

The United States publishes two different light lists. The U.S. Coast Guard publishes the Light List for lights in U.S. territorial waters; NIMA publishes the List of Lights for lights in foreign waters.

Light lists furnish detailed information about navigation lights and other navigation aids, supplementing the charts, Coast Pilots, and Sailing Directions. Consult the chart for the location and light characteristics of all navigation aids; consult the light lists to determine their detailed description.

The Notice to Mariners corrects both lists. Corrections which have accumulated since the print date are included in the Notice to Mariners as a Summary of Corrections. All of these summary corrections, and any corrections published subsequently, should be noted in the “Record of Corrections.”

US Coast Guard Light List, Vol 1    US Coast Guard Light List, Vol 2

US Coast Guard Light List, Vol 3    US Coast Guard Light List, Vol 4

US Coast Guard Light List, Vol 5    US Coast Guard Light List, Vol 6