It shows depths of water and navigation routes, including islands and Coastlines.
water depths and navigational routes
Such a map is commonly known as a nautical chart.
Nautical maps are used by sailors and mariners to navigate the open seas. These detailed maps show water depths, shoreline markings, submerged hazards, and other important information to help ensure safe passage for ships. Nautical maps are essential tools for plotting courses, avoiding obstacles, and reaching intended destinations at sea.
The Mercator projection is the standard for nautical navigation.
a physical map
water depths and navigational routes
Marine Chart or Nautical Chart.
Nautical chart
Such a map is commonly known as a nautical chart.
Water depth.
See related link for a star map
according to my map, its about 3 inches
navigation on water.
You would use a nautical chart. Nautical charts are specifically designed to show water depths, navigational aids, obstructions, and other information important for safe navigation on bodies of water.
Use a chart not a map. WGS 84 is probably the best datum
The word nautical miles are frequently used by mariners, seafarers, a measure of distance on a geographic map and standard of measure S.I.
it's called a chart. Nautical maps are referred to as "Charts".