The first travel technique involved using a standard 104 key
keyboard from Dell (Dell SK-8135) to control 3 DOFs (Fig. 3). The
four directional arrow keys had two translation DOFs: fore/aft
and left/right without any rotation (a.k.a. strafe). The 4 and 6 keys
of the numerical keypad produced a rotation along the horizontal
plane, around the vertical axis (a.k.a. yaw). Speed was constant
at 5 m/s for translations and 180/s for rotations.