Reading the nautical charts types and scales

Here are the different types and scales of charts:
Sailing charts, where the scale is 1:500,000 and smaller, are used for offshore navigation beyond sight of land.
The general charts have a scale of 1:150,000 – 1:500,000, and give wide-ranging offshore coverage with sufficient inshore detail to make landfall sightings easy. Fisheries charts use these scales.
The coastal chart uses a scale of 1:50,000 – 1:150,000, and is used to show uninterrupted wide-ranging coverage with adequate inshore detail to make landfall sightings easy. Fisheries charts also use these scales.
The approach chart has a scale of 1:15,000 – 1:50,000, and is used for approaching coasts where great detail is required.
Harbour charts, which have a scale is1:5,000 – 1:15,000, are used for navigation in harbors or intricate, hazardous, shoal-infested waters.
Bar Scales: a bar scale is a graphic scale represented by a line or a bar that is subdivided into nautical miles, feet, or meters. This bar is used for measuring distances on the chart.
Elevation Contours: these are lines connecting points of equal elevation. They are a graphical way of showing the shape and slope of hills and mountains that might be helpful in identifying them on the chart. Once identified, they can help identify your location on the water.