A communication handset comprising a receiver for receiving a RF signal incorporating reference altitude and associated atmospheric pressure data; a pressure sensor for measuring atmospheric pressure and processing means for determining from the received atmospheric pressure data and measured atmospheric pressure the difference in altitude between the handset and the reference altitude. More specifically, the present invention relates to the E-O crystal elements showing super-high linear E-O coefficient yc, e. At least one motor is operatively connected to the cover members to move the cover members at least between the closed and open positions thereof. An abutment surface can be provided within the pocket for engaging the tip insert andor other associated components so as to limit the extension of the tip insert to the predetermined extended position such that the tip insert does not impinge on the stationary compressor structure and such that a spring operatively associated with the tip insert does not overextend its operational limits. Other forms of hybrid cursors are disclosed that indicate the results of a drag operation, and quantitative data pertaining to objects being dragged.