Glossary

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Contents

Activate

When you have bought a Nuno Navigator license you will need to activate your copy of Nuno. This connects the Nuno Navigator software on your computer with the license you have bought. See Activate Nuno Navigator.


ActiveCaptain

Crowd sourced information about everything of interest to the mariner. An interactive cruising guidebook which you can use and are encouraged to contribute to.

ActiveCaptain is available for both the US and Europe, and you can use your free ActiveCaptain login to view ActiveCaptain data in Nuno.

See activecaptain.com

Altitude

The vertical angle from the horizontal to a celestial object such as the sun, moon or a star. A negative value indicates an object below the horizon.

May also be described as Elevation Angle.


Approach

One of the six navigational purposes provided by ENC charts.


Area

A polygon drawn on the chart.

In Nuno Navigator, you can choose the purpose (or meaning) of each area. Areas of each purpose are indicated on the chart with a different color.


Azimuth

The horizontal angle from north to a celestial object such as the sun, moon or a star. A value of 090° indicates an object due east of the observer.

May also be described as Bearing, though Bearing tends to be used for terrestrial objects and azimuth for astronomical ones.


Base Issue Date

Each cell is issued as an original cell, followed by any number of incremental updates. This date is when the original cell was issued. (Base Issued in the Nuno Navigator Catalog.)


Berthing

The most detailed navigational purpose provided by ENC charts. Only available for small areas, typically berths in harbors.


Cell

ENC chart data is divided up into cells. Each cell covers a certain geographic area. Sometimes more than one cell may cover a particular area; for example, there may be a detailed cell for a particular harbor, even though the harbor area is also covered by a larger less detailed cell.


CherSoft

The company that created Nuno Navigator. See www.chersoft.co.uk.


Civil Twilight

The time of Civil Twilight is when the center of the sun is 6° below the horizon.

This is the time of evening, when it generally becomes impossible to read outside without artificial light.

See also Nautical Twilight and Standard Twilight.


Compilation Scale

A computer can theoretically display an ENC chart at any scale. If the data is only accurate to the nearest 100 nautical miles, however, it would be misleading and unsafe to display that data at a scale of 1:20000. To help with this problem, all ENC cells come with a compilation scale. Using the ENC cell at greater scales than this is not recommended and may be unsafe. Nuno Navigator will display a warning if you do this.


Coastal

One of the six navigational purposes provided by ENC charts.


Context Menu

A menu that appears when you click the right mouse button. This menu shows the options for the item that you clicked on. Many items in Nuno Navigator have a context menu: try right clicking on the chart, or on any of your routes or waypoints.


EBL

Electronic Bearing Line

Originally a RADAR term, EBL refers to a dynamic ray drawn on the chart from you current boat position through the cursor. It shows all the points on that bearing from your boat.


ENC

The type of vector chart displayed by Nuno Navigator. See Raster, Vector and ENCs.


Folder

Overlays can be organized into Folders in the Overlay Window (accessed via the Show button on the toolbar).

A folder can contain any mixture of routes, areas, lines and points, and other folders.

A folder can be makred as hidden so that its contents are not displayed on the chart. This is useful for old routes and passage plans.


Gazetteer

A compilation of useful place names and their geographic positions. Nuno Navigator contains an extensive gazetteer which is displayed automatically on the chart.


General

The second least detailed navigational purpose provided by ENC charts.


Harbor

The second most detailed navigational purpose provided by ENC charts. This is the most detailed available chart information for many harbors.


Hover Tip

A small floating yellow box that appears when you hover over an item using the mouse. The Hover Tip contains information about the item and what you can do with it.


Line

A line drawn on the chart.

In Nuno Navigator, a line is always a rhumb line.


Nautical Twilight

The time of Nautical Twilight is when the center of the sun is 12° below the horizon.

This is the time of evening, when it generally becomes impossible to see the horizon.

See also Civil Twilight and Standard Twilight.


Navigational Purpose

ENC charts are available for a wide range of scales. They are divided into layers according to the following intended navigational purposes, which broadly, depend on scale:

At any one geographic position there will only be one ENC chart for a particular navigational purpose. As you zoom in on an ENC chart, the chart will get larger, but coarser, until the scale is detailed enough to display the ENC data for the next navigational purpose (assuming there is any at that geographic position of course). When that navigational purpose is displayed, you will see much more detail on the chart. NOAA

The National Oceanic and Atmospheric Administration (NOAA) provides free ENC (vector) charts for the entire US coastline. These are the charts that Nuno Navigator uses. NOAA provides free weekly updates to its ENC charts. NOAA also supplies raster data, but Nuno Navigator doesn't use this.


NOAA

The National Oceanic and Atmospheric Administration.

Provides free ENC (vector) and BSB (raster) chart for the entire US coastline.


Overlay

An overlay is additional information that is displayed on top of (i.e. over) the chart.

In Nuno Navigator, there are route, area, line and point overlays, which can all be organized in folders. You can decide on the organization you want to use. Old routes are always available without cluttering up your current one.


Overscale

An ENC cell is overscaled if you are viewing it at a greater scale than its compilation scale. This is not safe; the data is not accurate enough to support navigation at this scale. Zooming in may be useful to see what’s there but it doesn’t make the data any more accurate!


Overview

The least detailed navigational purpose provided by ENC charts. Typically overview data covers large areas, such as the whole of the eastern seaboard of the USA.


Overview

In Nuno Navigator, the Overview is the inset on the passage planning view which shows a wider area at a smaller scale. It can be used to move around the chart quickly.

It also displays chart quality information based on the CATZOC values in the NOAA ENC charts:

CATZOC Position
Accuracy
10m Depth
Accuracy
Meaning
A1 +/- 5m + 5% depth +/- 0.6m Full area search undertaken. Significant seafloor features detected 4 and depths measured.
A2 +/- 20m +/- 1.2m
B +/- 50m +/- 1.2m Full area search undertaken. Significant seafloor features detected 4 and depths measured.
C +/- 500m +/- 2.5m Full area search not achieved, depth anomalies may be expected.
D Worse than C Worse than C Full area search not achieved, large depth anomalies may be expected.
U Unclassified


Point

A overlay which marks a single geographic position on the chart. The point is indicated on the chart using a symbol and a text label.

In Nuno Navigator, there is a choice of symbols and you can edit the label for each Point directly on the chart.


Raster Chart

Raster Charts are a type of electronic chart which has been laid out by a cartographer at a particular scale and level of detail. The electronic chart itself is only a picture, and is fixed to the scale and detail provided by the cartographer. Nuno Navigator does not use raster charts. See Raster, Vector and ENCs.


Route

A planned route joining a number of waypoints.

In Nuno Navigator, waypoints are joined by rhumb lines.


Route Monitor

A mechanism to make it easy to compare your boats current position with the planned route.

In Nuno Navigator, all the information that indicates the boat's progress along the route and proximity to the route is displayed in the Route Monitor window, which is accessible from the Show button on the toolbar.


Standard Twilight

The time of standard twilight is when the center of the sun is 50 minutes of arc (0.8333°) below the horizon.

This is the time of evening, when the whole of the sun has just disappeared over the horizon.

See also Civil Twilight and Nautical Twilight.


UKHO

The United Kingdom Hydrographic Office.

Provides ENC (vector) and ARCS(raster) chart for most of the world.


Update

Updating Nuno Navigator information by downloading only the changes. This greatly reduces the amount of data that has to be transfered over the internet.

Applies to both chart data and ActiveCaptain data.


Vector Chart

Vector Charts are a type of electronic chart in which the computer stores rich information about each feature on the chart. The computer decides dynamically how best to draw the features. The computer can decide how which information to present, depending on the circumstances, and can draw the chart at a variety of scales. The charts that Nuno Navigator uses are all vector charts. See Raster, Vector and ENCs.


VRM

Variable Range Marker

Originally a RADAR term, VRM refers to a dynamic circle drawn on the chart centered on your current boat position through the cursor. It shows all the points at that range from your boat.

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