Adding more layers
In CONSTRUCT mode, at the top of the Data Library list, click the dropdown menu and choose World. Add the following layers: Lines of latitude and longitude and World Cities.
Selecting features from a layer
In VISUALIZE mode, click on the Re-center Projection Button and click in the North Atlantic to place the study area at the center. Use the zoom tool to move in closer. Make World Cities the active layer by clicking the layer; a yellow border will surround the layer. Click the Show Table of Active Layer tool. Click the field name to alphabetize the list of city names. Hold down the control key and select the names of the following cities: Boston, Halifax, Liverpool, London and Philadelphia. Click the Make Selection from Rows button, MyWorldGIS will ask you to name the selection, name it CityHarbours. In ANALYZE mode choose Convert/ Convert Selection to layer tool. Name the new layer CityHarbours. Click OK. The new layer CityHarbours will appear in the layer list. Make the layer CityHarbours prominent by double clicking the layer and making the symbol for cities larger. In the Layer Menu, choose Save Layer As CityHarbour in the Shipwreckdata/Created folder. Remove the World Cities layer. See Figure 10.
F igure 10: Visualizing all the layers
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