Bathymetric Chart 13242-12B: NORTH PACIFIC OCEAN J2 - Sulawesi & Timor to Papua This is because whole horizon

This is because whole horizon mirrors are generally preferred by beginners who later may wish to change to a traditional mirror as proficiency is attained (see "Selecting A Marine Sextant")

4 Classification Society Requirements

Tanjung Selatan to Pulau Laut including Pulau-Pulau Lima is a standard nautical chart

Captain Ahlstrom is a Captain (0–6) in the United States Navy Reserve

British Admiralty Nautical Chart  2966: Kol`skiy Zaliv is a standard nautical chart

Bathymetric Chart 13242-12B: NORTH PACIFIC OCEAN J2 - Sulawesi & Timor to Papua This is because whole horizonThe chart you are viewing is a bathymetric chart by OceanGrafix. It is designed to present an accurate, measurable description and visual presentation of the submerged terrain in this area.