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Sight Reduction Tables for Marine Navigation - Pub. 229 (HO-229) Vol. 4 Latitudes 45-60 The Coastal Waters of Southeast Alaska and British Columbia Semidi Islands is a standardSIGHT REDUCTION TABLES FOR MARINE NAVIGATION Pub. No. 229 (HO 229) Volume IV Latitudes 45 60 Commercial Edition This is the standard set of tables designed for marine navigation. Although there are 6 volumes in a set, only those pertaining to the latitudes anticipated need be obtained. Their tabular data, being purely mathematical results, never go out of date. The latitudes listed for the Volumes work for either northern or southern hemisphere. IMPA