US Chart 1 & NOAA Tides & Currents Flashcards
Light Range Visibility is given in nautical miles except in what areas?
A lights range or visibility is given in nautical miles, except on the Great Lakes and adjacent waterways, where light ranges are given in statute miles.
PA
Position approximate (not accurately determined or does not remain fixed)
PD
Position doubtful (reported in various positions)
Observation Spot
Distance along waterway, no visible marker.
Distance along a waterway with visible marker.
fm, fms
Fathom(s)
kn
Knot(s)
t
Ton(s), Tonnage (weight)
Local magnetic anomaly. Within the enclosed area the magnetic variation may deviate from the normal by the value shown.
St M
St Mi
Statute mile(s)
var
VAR
Variation
BM
Benchmark
mag
Magnetic
brg
Bearing
Coastline, surveyed
Coastline, unsurveyed
Cliffs, Steep Coast
Sandy shore
Stony shore, Shingly shore
Contour lines with values and spot heights.
Marsh, Swamp, Reed beds
Buildings