Patent ID: 8390573

Claim:
A data input device comprising: (a) a body having a rearward face and a forward face; (b) a display located on the forward face of the body; (c) a first key located on the rearward face of the body; (d) a first map point displayed on the display, the first map point configured to indicate the location of the first key; (e) a second key located on the rearward face of the body; (f) a second map point displayed on the display, the second map point configured to indicate the location of the second key; (g) a an input field displayed on the display; (h) wherein the first map point is a ghost image; (i) wherein the first key is depressible to a first position, in which the first key is not fully depressed, and a second position, which is more depressed than the first position; (j) a non-transitory computer readable program code, encoded in a computer-readable medium executed by the data input device, the program code comprising: (i) program code for identifying the depression of the first key to the first position; (ii) program code for displaying the map point on the display in response to the depression of the first key to the first position; (iii) program code for identifying the depression of the first key to the second position; (iv) program code for generating a first predetermined alphanumeric character on the display in response to selection of the input field and the depression of the first key to the second position; (v) program code for identifying the depression of the second key; (vi) program code for generating a second predetermined alphanumeric character on the display in response to the depression of the second key; and (k) wherein the ghost image is adjustable in intensity.