How do I download Linz charts?
All charts are available for individual download through the LINZ Data Service, and will be updated as new data becomes available. These charts are based on the official Raster Navigational Chart series produced by the New Zealand Hydrographic Authority, available on the LINZ website.
How do you read a sea chart?
The first number indicates the number of fathoms. The second number, which will be a small subscript, is the number of additional feet. For example, a listing of 0 and 3 means a depth of 0 fathoms, 3 feet. A listing of 3 and 2 means 3 fathoms, 2 feet, or 20 feet total.
How do you use navigation charts?
Bring along a ruler to use with your chart. Using the chartplotter or a GPS position from a cellphone, plot your position on the paper chart as you go along. To plot your course on paper, simply take the latitude and longitude coordinates from the GPS. Find the corresponding coordinates on the edges of the chart.
What are the numbers on a marine chart?
Numbers on a nautical chart are depth measurements. Water depths are measured by soundings usually acquired by hydrographic surveys. The depths may be in either feet or fathoms (the chart will indicate which). A fathom is a nautical unit of measurement and is equal to six feet .
What are the squiggly lines on a nautical chart?
This effect is known as ‘overfalls’. A shallow sea, fast currents and more dramatic submarine landscape… all make the water rougher. Overfalls are most common near the coast and nautical charts usually mark these areas with squiggly lines to warn inshore sailors of the hazard.
What do the numbers mean on a marine chart?
Numbers on a nautical chart are depth measurements. A fathom is a nautical unit of measurement and is equal to six feet . On a chart, water depths may be connected with a line known as a depth contour, similar to the topographic lines or surface features that you see on a map.
What does a marine chart show?
A nautical chart is one of the most fundamental tools available to the mariner. It is a map that depicts the configuration of the shoreline and seafloor. It provides water depths, locations of dangers to navigation, locations and characteristics of aids to navigation, anchorages, and other features.
How are depths shown on charts?
The depths may be in either feet or fathoms (the chart will indicate which). A fathom is a nautical unit of measurement and is equal to six feet . On a chart, water depths may be connected with a line known as a depth contour, similar to the topographic lines or surface features that you see on a map.
What does M mean on marine chart?
M Nautical Mile (1 minute of latitude) MHWN Mean High Water Neaps.