4 nautical charts
TRANSCRIPT
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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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Use of the NGA Catalog
Rio de Janeiro lies in Region 2
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Step #2 Locate the
Small-scale Coastal Chart
Use of the NGA Catalog
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Use of the NGA Catalog
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?