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Protractor scale
1 Watchkeeping Responsibilities
hollow equilateral triangles superimposed on one another and upside down to each other
8 Incident Control Centres
1999 Edition
NGA Nautical Chart 17421: Stewart-Portland Canal Gulf of Riga Protractor scaleThe chart you are viewing is a NGA standard nautical chart. The National Geospatial Intelligence Agency (NGA) has partnered with OceanGrafix to provide commercial and recreational mariners with a good source of nautical chart coverage for international waters. These charts are "printed on demand" but do not contain the latest notice to mariner (NTM) corrections. It is the mariner's responsibility that the necessary chart corrections be applied to
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