Help: Toolbar
Arrow cursor - used for selection and location 
Pan - move the map to your area of interest 
Save Options 
Navigation - zoom in, zoom out; how to scroll.- Play tutorial movie(requires Flash)
Profile - create a relief profile across your grid.
- Play tutorial movie(requires Flash).
Digitizer - select and save points from the map view. - Play tutorial movie(requires Flash)
Layer - import shapefiles and .grd files; view Alvin photos, bathymetry, magnetics, age and sediment thickness grids; view data for Ridge 2000 and MARGINS study sites; much more 
Show/hide graticule lines (Polar projections only)
Focus - sharpen image (usually done automatically)
Mask function - highlight areas with high resolution topography (~100 m node spacing).
- Play tutorial movie(requires Flash)
Contributed Grids - click to show available contributed grids.
Grid Tool - loads default grid, opens grid options window for new grid, coloring, 3D, more.- Play tutorial movie(requires Flash)