Layers Interface
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button on the main tool bar toggles a Layers dialog:
button opens this help page in a web browser.
button to add layers. Another dialog pops up:
is enabled, clicking it will open a browser page with additional information on the data.
will zoom to the bounding box of the selected shape (right table), or, if no shape is selected, of the selected shapefile. If the selected shape is a dimensionless point (type = 1, 11, or 21), the zoom will not do anything. Control+click on the selected shape to de-select it.
Now if you select any dive within the attribute table, the navigation track for this dive will be highlighted in map view. Or you can select a track in map view and the corresponding dive will highlight in the attribute table. Once you select a dive, the open shape tool 
is activitated and turns yellow. Clicking on the open shape tool opens the shape file for that dive so it now appears in the shape file table and a list of all Alvin photos for that dive appears in the attributes window. The location of each photo is now plotted in map view. Click on the open shape tool again to open the Photo window. Use the toggle menu in the Photo window to choose between both of Alvin's cameras. Use the arrows to advance forward and backward through the dive.
You can now navigate through the dive by clicking on photo locations shown in your map view or using the arrows in the Photo window.
You can open and view multiple shapefiles. For example, go back to the Import Layers menu, select Alvin Imagenex grid. Click Ok, Select the EPR_composite in the shapefile table, click on open shape tool and Load Grid to display a 1-m resolution bathymetry grid which was created using the Imagenex sonar on Alvin.
Use the 
to close any shape files you are finished with.
STEP-BY-STEP EXAMPLE: IMPORT GRID
To import a GMT grid file (in GMT’s netCDF .grd format) click the Layers button to open the Layers dialogue box.
Click the Folders button to bring up the Import Layers dialogue box.
Select Import Grid and hit OK. The ImportGrid window appears.
Click the Import Grid button. An Open window appears and allows you to browse for your GMT .grd grid file.
Select the grid that you wish to import.
Click Open. A new window, called define projection, pops up.
In the Projection drop-down menu, select between Geographic and UTM grid projections. For a UTM grid, select the UTM zone. Hit OK. The grid is now being read in to GeoMapApp and is being indexed in each of the levels of nested resolution. The progress of this indexing is displayed in the Import Grid window.
When the grid has been indexed, an entry for it appears in the Layers window. Note that due an error the name of the folder containing the grid is listed, not the grid name itself.
Use the mouse to select the grid by clicking once on its (folder’s) name
To make the grid visible in GeoMapApp, click the yellow light bulb symbol to bring up the Load Grid window
And click the Load Grid button. This loads the grid into the GeoMapApp interface window where it is visible as a geo-referenced overlay, and the Palette Tool window appears.
Use the zoom buttons to zoom in to the area of your grid.
The imported grid can be manipulated (coloured, illuminated, contoured, profiled, saved, overlain with imported data points, etc) in just the same way as the native GeoMapApp DEM tiles. Note that the imported grid is not merged with the GeoMapApp global DEM tiles – it is a geo-referenced overlay grid.
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