What does R mean on nautical chart?

Rk, R or Rks – Rock or Rocks. Hk or Wk – Hulk or Wreck. Obstn – Submerged Obstruction. Co – Coral.

What does H mean on a nautical chart?

Many charts show so or sft; h or hrd–alone, without a bottom type. Locate the closest bottom type within a mile. For example, if you see S within a mile of a hrd abbreviation, there’s a good chance the bottom consists of hard sand. An M would mean hard mud.

What does asterisk mean on nautical chart?

A symbol that looks like an asterisk means the rock will uncover (become visible) at low tide. A plus sign with dots in the corners means the rock lies just beneath the surface–or awash–even at low tide.

What do numbers mean on a nautical map?

depth measurements
Numbers on a nautical chart are depth measurements. The depths may be in either feet or fathoms (the chart will indicate which). In addition to showing water depths, a nautical chart also tells mariners about dangers to navigation, aids to navigation, anchorages, and other features.

What do the buoy colors mean?

The system uses a simple arrangement of colors, shapes, numbers and light charac- teristics to show the side on which a buoy should be passed when proceeding in a given direction. Conversely, when proceeding toward the sea or leaving port, red buoys are kept to port side and green buoys to the starboard side.

Which is a can buoy?

can buoy. noun. nautical a buoy with a flat-topped cylindrical shape above water, marking the left side of a channel leading into a harbour: red in British waters but green (occasionally black) in US watersCompare nun buoy.

What chart is used as general track charts in the high seas?

Different formulas produce different projections and there are many types, each with its particular characteristics. Nautical charts are usually one of three: Gnomonic (pronounced no-monic), Polyconic and Mercator. The Mercator projection is the most common.

What does Nautical Chart No 1 indicate?

The Symbol Legend for U.S. Nautical Chart Products. U.S. Chart No. 1 describes the symbols, abbreviations, and terms used on nautical charts. It is produced by NOAA and the National Geospatial-Intelligence Agency.

What are the colors found on a nautical chart?

Knowing how nautical charts are color-coded can help you avoid running aground and find good fishing spots. White signifies deeper water, blue signifies shallower water, and green shows areas that are sometimes exposed on low tide. Have any questions about reading nautical charts?