Intercommunication apparatus, namely, apparatus for transmission of communication; Two-way wireless communication devices for data transmission; Point-to-point transmitters, namely, radio and telecommunications transmitters; Interactive data transfer apparatus; Data communications and transmission apparatus; Wireless communication apparatus for data transmission; Signal processing apparatus for transmission of electronic and digital signals; Signal transmission apparatus for transmission of electronic and digital signals; Telecommunications apparatus, namely, tracking devices that connect to computers, mobile telephones and handheld computers; Data processing apparatus; Data exchange units, namely, electronic devices in the form of a handheld unit for exchanging data between themselves and other electronic devices in the vicinity; Electrical signaling apparatus, namely, a handheld electronic device that provides audible notifications; Computer databases, namely, an electronic database in the field of location information; Computer databases, namely, an electronic database in the field of location information, recorded on computer media; Application software for processing and communicating data used in connection with detection, tracking and position-fixing apparatus; Interactive computer software for processing and communicating data used in connection with detection, tracking and position-fixing apparatus; Computer software for application and database integration; Computer application software for mobile phones, portable media players, handheld computers, laptops, personal computers, namely, software for data processing