When the direction of view is controlled using the mouse, the focal point will be represented by a small cross symbol.
These icons will be displayed in the 3D view when collisions or certain conditions are recognized by the Virtual Walkthrough tool. When climbing steps (Walk-through mode with Tank-controls), make sure that the yellow icon is displayed. If not you can adjust your position using the F and R keys.
Use this setting to turn the directional compass, located at the top right of your 3D view, on or off. North = Z axis. The arrow(s) will represent the following, depending on the mode (Options tab) you are in:
A red icon will be displayed at the bottom right of your 3D view when recording a movement using the options in the Record Movement tab. Use this setting to turn this icon display on or off.
Stairs Level Plane / Falling Level Plane / Collision Level Plane
The threshold values (see Scale and ThresholdTabs) can be displayed in the viewport. How they are displayed is defined as follows: