4 nautical charts

8/8/2019 4 Nautical Charts

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Navigation

NAU 102

Lesson 4


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Projection Comparisons


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OtherProjections

Stereographic/Orthographic

Used for polar

navigation anddecoration

Points

projected fromopposite side of the earth

or from infinity


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Plotting Sheets

Used mid-ocean

Pre-labeled latitude

lines

No land/ocean features

Unlabeled longitudelines

You can make your

own!


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Plotting Sheets

Universal Plotting Sheet

You label the latitude lines

Can be used for any latitude/longitude

You draw the longitude line

s

Longitude scale varies

by mid-latitude


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Chart Scales

Scale the ratio of a given distance on the

chart to the actual distance which it

represents on Earth.e.g. 1:80,000 or 1/80,000

1 inch on chart = 80,000 inches on Earth


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Chart Scales

Scale can be stated by:

e.g. 1:80,000 or 1/80,000

e.g. 2 inches

to the mile

Ratio or fraction

A statement

A graphic scale


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Chart Scales

Small Scale = Large Area

e.g.

1/100,000 vs. 1/10,000

Large Scale = Small Area

The larger the scale, the

greater the detail.


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ChartProduction

National Geospacial-Intelligence Agency

(NGA)

Charts are produced by the government

FormerlyN

ational Imagery and MappingAgency (NIMA)

Charts of foreign waters:

Lots of other names, too!


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ChartProduction

National Ocean Service (NOS)

Part ofNational Oceanography &

Atmospheric Administration (NOAA)

Charts ofUS coastal and inland waters:


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Chart Numbers

1 digit no scale

Charts are numbered with 1 to 5 digits.

2 digits 1:9,000,001 and smaller

3 digits 1:2,000,001 to 1:9,000,000

(e.g. Chart No. 1)

4 digits Special Purpose(e.g. Plotting Sheets)

5 digits 1:2,000,000 and larger


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Chart Numbers

1st digit = Ocean Basin

2 & 3 Digit Charts

Cover entire (or most of) ocean basins


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Chart Numbers


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Chart Numbers

1st digit = Coastal Region

5 Digit Charts

Most common charts, day-to-day use.

(Not the same as Ocean Basin)

1st & 2nd digits = Subregion

Digits 3-5 = Specific Location

(Counterclockwise within subregion)


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Regions and Subregions


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Chart Numbers


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Chart Catalogs

Free

Produced by NGA and

NOS

Lists authorized sales

agents

Several volumes, by

location

Lists all available charts


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Use of the NGA Catalog

Step One: Review the index of the

worlds coastal regions/subregions.

Example:You are planning to enter Rio de

Janeiro, Brazil.


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Rio de Janeiro lies in Region 2


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Step #2 Locate the

Small-scale Coastal Chart



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Step #3 Locate the HarborCharts


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Chart Scales

Charts are classified by Scale

Used for mid-ocean navigation

Sailing charts >1:600,000

General charts 1:150,000 to 1:600,000

Coastwise navigation

Outside reefs and shoals


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Chart Scales

Inshore coastal navigation

Coastal charts 1:50,000 to 1:150,000

Harbor charts >1:50,000

Small harbors & anchorages

Entering Large bays


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Chart Stock Numbers

For purchasing and inventory purposes.

26 = subregion

E.g. 26AHA26230

26A = portfolio number

HA = chart series

26230 = chart number

HA = harbor

CO = coastal

GN = general

WO = world


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ChartOrdering

Can buy a portfolio

Can purchase individual charts

(E.g. 26A = General & Harbor charts

for 26)

You must have the latest, large scale chart

for your location.

All (or most) charts in a subregion


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ChartOrdering

Latest version is printed upon order and

shipped overnight

Print on demand

Authorized Chart Agent

Copies on hand

http://www.oceangrafix.com

http://www.naco.faa.gov/Agents.asp

May need correcting prior to use


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Introduction to Navigation

Questions?

4 nautical charts

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