A portable (e.g., watch-sized) wireless electronic device configurable to reflect the identity, preferences or characteristics of the user, and adapted to determine the nearby presence and location of a compatibly configured device includes a microcontroller, data communications subsystem configured to enable two way digital radio communication; a received signal strength indicator subsystem operably coupled to the data communications subsystem and configured to provides a micro-controller subsystem with information about the strength of received signals; a range estimate indicator subsystem operably coupled to the microcontroller and configured to display an estimate of the range to a target unit based on signal strength observed during a scan for the direction of maximum signal strength; a compatibility indicator subsystem operably coupled to the microcontroller and configured to provide an indication of a possible degree of compatibility of a user assigned to a opposing unit; a computer interface subsystem adapted to communicate with a user's computer; and a user control subsystem configured to enable user input.