Bathymetric Chart 13242-12B: NORTH PACIFIC OCEAN J2 - Sulawesi & Timor to Papua British Admiralty Nautical Chart 106:

British Admiralty Nautical Chart 106: England - East Coast

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")

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

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

NOAA Nautical Chart 18686: Pfeiffer Point to Cypress Point

Bathymetric Chart 13242-12B: NORTH PACIFIC OCEAN J2 - Sulawesi & Timor to Papua British Admiralty Nautical Chart 106:The 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.