NGA Nautical Chart 61500: Madagascar-South Coast Chart Instruments Knowledge of metal corrosion and

Knowledge of metal corrosion and its prevention are vital for the safety and integrity of a boat

The real method of plotting equips the deck officer to pass the Coast Guard’s radar observer test

For all other uses

British Admiralty Nautical Chart 4021: South Atlantic Ocean Eastern Part is a standard nautical chart

NGA Nautical Chart 61500: Madagascar-South Coast Chart Instruments Knowledge of metal corrosion andThe 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