Parts of the Screen:

Project Buttons: New, Open, Save
GPS: Tracking On/Off
Display Buttons: Pan, Zoom In, Zoom Out, Zoom Extents, Zoom Window, Auto Center
Asset Tools: Add Asset, Select, Inventory, Condition, Asset History
Selection info: from the Select tool. Displays data for the currently selected item.
Layers: from the New project wizard, or the menu Edit > Attach Layer.
GPS feed: active when Tracking is On
Projection: matches the GPS signal to data layer so that the current position is shown on the map.
Scale bar: the length of the line shown in the units of the projection.
Position: the current coordinates of the pointer on the map.
Map: displays the data from the layers and assets.