How to use the catalogue

General Layout:

Function Buttons:

Information Window:

This is the view when you first enter the program:

This is an example of the view after the "Select by rectangle" function has returned two ENC cells (highlighted):

Function Descriptions:

1 -  Toggle between Legend and LayerList:

The legend option provides details of the colour coding system in use on the map.

The tick boxes in the layers section allow you to define which themes you wish to display on the map. When you first enter the program, all of the 6 usage band layers within "ENC Coverage" (for which actual data coverage limits are shown), plus the remaining available ENCs within "Other ENC" (for which only rectangular cell limits are shown) will be automatically selected for display. The folders "ENC Coverage" , "Other ENC", and "Administrative" will already be expanded, showing the layers available in each. You can click on the yellow folder "Ocean Themes" to view the layer available inside.

You can switch each of these layers on or off independently using the tick boxes. To turn all layers within a particular folder on or off in batch, use the tick box next to the yellow folder symbol.

Please note that if you switch off the "Auto Refresh" option, you will need to click on the "Refresh Map" button each time you have changed your selection of what layers you wish to view before this change is reflected on the map (suitable for slowere dial up connections where you wish to select / deselect more than one layer at a time and only wish to refresh the screen once). If you have the "Auto Refresh" option ticked, the map refreshes automatically each time you select / deselect a layer (suitable for faster internet connections).

The circular radio buttons to the right of each tick box allow you to define which theme you wish to set as the active layer, and therefore which information is processed when using one of the selection functions described below. When you first enter the program, the “Overview” layer (i.e. small scale ENCs) will be selected as the active layer. Only one theme can be selected as active at the same time, and must also be visible on the map (i.e. the tick box is selected) before it will become active. The active layer changes immediately when you check a different radio button, and the programme will allow you to repeat certain functions (e.g. the route or area selection tools) for the new layer.

The small mouse icon to the right of the layers within the "ENC Coverage" and "Other ENC" folders allow you to swith on or off the labels (i.e. the cell names) for the ENCs within these layers.

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Use this button to magnify a particular area of interest. Use your mouse to place the cross-hair over the area you wish to zoom into and click the left mouse button. The system will centre on the cross-hair position. This process may take a few seconds to complete depending on how fast your internet connection is. Repeat the process until you have a suitable display.

Alternatively, you can use your mouse to click and drag a rectangle, and the program will zoom to this area.

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Use this button to view a larger geographical area on your screen. This function works in a similar way to the “Zoom In” button described above.

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Use this button to return to the world view in one step, rather than having to use the “Zoom Out” button several times. This is a faster way to zoom out and then focus on another part of the world quickly.

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Use this button to zoom to an appropriate scale to cover all ENC data which can be found in the active layer that you have selected. This will typically be a world view where the data in a given layer is spread widely.

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Use this button to return to the previous zoom level.

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Use this button to make small changes to the geographical area on view, without changing the zoom level. Click on the left mouse button, hold, and move the mouse left – right – up – down and then release the left mouse button in order to re-centre the display, and so pan around the world. This function does not affect the map display when the whole world is in view.

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Use this button to pan the map to the north without changing the zoom level.

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Use this button to pan the map to the south without changing the zoom level.

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Use this button to pan the map to the west without changing the zoom level.

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Use this button to pan the map to the east without changing the zoom level.

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Use this button to click on a cell on display which belongs to the active layer in order to see a new window which shows where you can purchase this ENC from. This works in much the same way as clicking on the URL column of the selection table within the information window (refer to the "Identify" function below)

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Use this button to obtain further information about a particular ENC cell on display on the map which belongs to the active layer. Use your mouse to place the cross-hair somewhere within the limits of the ENC cell you are interested in and click the left mouse button.

The information window at the bottom of your screen will then display details of all ENCs within the active layer which cover that point you have clicked on. It will provide details of the ENC cell name, the usage band it belongs to, the cell title, a comment (for example the unit that the ENC cell belongs to for ordering purposes or where you can purchase it from), the scale of the ENC, and a link to the website of the supplier of the ENC (where appropriate). Please remember that only ENCs from the selected active layer will appear in the information window table. This button will therefore only work if the map is displaying examples of ENCs which belong to the layer which is selected as “Active”.

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You can also use this function to put together more complex queries with a number of different criteria processed together. Use the “And”, “Or” and “Not” buttons as appropriate to build your query. For example, with the "Overview" layer selected, you may wish to view all GB produced ENCs which have a scale of 1.5 million. In this case, the Query String would look like:

CELL_NAME LIKE "GB*" AND SCALE = 1500000

All ENCs from the active layer which meet your defined criteria will then be listed in the new table that will appear in the information window. These ENCs will also be shown on the map in blue. At the bottom of this table, you can click on the “Zoom to these records” link and the program will reset the map so that all of the selected ENCs are displayed at the optimum scale (may result in zooming in or zooming out).

The left hand column of the table (“Rec”) provides the record number for each ENC which has been selected. By clicking on this field for the ENC which you are interested in, the program will reset the map so that this specific ENC is displayed at the optimum scale. You can then select other ENCs from the list to look at in more detail.

If your query returns more than 500 ENC records, you will see a prompt at the bottom of the table where you can scroll to the additional records.

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This button will only work if the map is displaying the layer which is selected as “Active”.

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Use this button to calculate the distance for a given route. Use the left mouse button and click waypoints on the map. You will see in the top left of the screen the total distance, and the distance of the latest segment of the route. The route will plot on the map in red.

Once you have completed the route and calculated the distance, you can then switch to the "Select by Line / Polygon" option (see details below) to identify the ENCs in the active layer which cross the route you have defined. If you then wish to know which ENCs in a different layer cross the route, you can select the new layer you are interested in, return to "Select by Line / Polygon" option, and repeat the process. You can continue to repeat this for any layer until you remove the route from the display by either clicking on the "Restart" button within the "Select by Line / Polygon" option or clicking on the "Clear selection" option.

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Use this button to create a buffer zone around one of your selections. For example if you have selected a group of ENCs from the active layer using the "Select by Rectangle" or "Select by Line / Polygon" options described below, you can set a zone around this rectangle / route of a defined size, and then list all ENCs from another layer which fall within this zone.

You must first define which layer you wish to select from the drop down menu, and then the size of the buffer zone you wish to describe. Then click on the "Create Buffer" button and you will see the zone drawn on the map with blue cross-hatch lines. If you tick the "Display attributes" box and click the "Create Buffer" button again, the ENCs from your chosen layer which fall within this zone will be listed in the information window.

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This button will only work if the map is displaying the layer which is selected as “Active”.

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This button will only work if the map is displaying the layer which is selected as “Active”.

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Use this button to clear any selections you have already made using one of the selection functions described above (Identify, Query, Find, Select by Rectangle, Select by Line / Polygon). This allows you at any time to start a new selection or other process from the beginning.

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If you wish to print one of your selection lists which appears in the information window, rather than the map, place the cursor somewhere over the information window and use your right mouse button to select the Print option.

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