2. GPS-Microphone GPS-Microphone GPS Processing Standard NMEA 2.0 GGA and RMC sentences Standard NMEA 2.0 GGA and RMC sentences Utilizes SIRF3 based receiver Utilizes SIRF3 based receiver Typical accuracy within 5 meters Typical accuracy within 5 meters Data Modem Interface FFSK/MSK data communication over existing voice channel FFSK/MSK data communication over existing voice channel 2400 bits-per-second data rate 2400 bits-per-second data rate FEC, CRC, Interleaving and data scrambling used FEC, CRC, Interleaving and data scrambling used Messages include 8 character unit ID Messages include 8 character unit ID

3. GPS-Microphone GPS-Microphone Poll-Based Position Reporting GPS-Mic always responds to location query requests from the Basestation GPS-Mic always responds to location query requests from the Basestation

4. GPS-Microphone GPS-Microphone Automatic Position Reporting Modes 1. Push-To-Talk (PTT) switch activated Position report sent either on every PTT or a time-throttled basis Position report sent either on every PTT or a time-throttled basis

5. GPS-Microphone GPS-Microphone Automatic Position Reporting Modes 2.Fixed-Time Based Periodic reporting of position Periodic reporting of position Time interval value : 1 – 255 Time interval value : 1 – 255 Time interval units: seconds, minutes, hours, or days Time interval units: seconds, minutes, hours, or days

6. GPS-Microphone GPS-Microphone Automatic Position Reporting Modes 3. Fixed-Distance Based Position reported if location change exceeds set distance threshold Position reported if location change exceeds set distance threshold Distance Threshold : 100 meters – 64 Km Distance Threshold : 100 meters – 64 Km Operational modes: absolute (e.g. geo-fence) or relative (between successive location reads) Operational modes: absolute (e.g. geo-fence) or relative (between successive location reads) Uses separate periodic time check which may be set by user Uses separate periodic time check which may be set by user

7. GPS-Microphone GPS-Microphone Panic Position Reporting Mode Special man down button on unit initiates periodic panic message with position report Special man down button on unit initiates periodic panic message with position report Manual activation/deactivation button press period is programmable Manual activation/deactivation button press period is programmable Rate of reporting to Basestation is programmable Rate of reporting to Basestation is programmable Basestation can acknowledge and deactivate through over- the-air command Basestation can acknowledge and deactivate through over- the-air command

8. GPS-Microphone GPS-Microphone On-Board Memory Features Unit can store up to 1500 position reports in non-volatile memory Unit can store up to 1500 position reports in non-volatile memory Programmable location storage modes: Programmable location storage modes: Conditional and Temporary Conditional and Temporary Only used to prevent data loss if currently unable to report Only used to prevent data loss if currently unable to report Copy or Audit Copy or Audit Locations are both stored on-board and reported over the air Locations are both stored on-board and reported over the air Deferred Over-The-Air Deferred Over-The-Air Locations are stored on-board but not reported over the air, unless directed to through Base station command. Locations are stored on-board but not reported over the air, unless directed to through Base station command.

9. GPS-Microphone GPS-Microphone Unit and Basestation Messaging Features High-reliability communication protocol using handshakes and retries High-reliability communication protocol using handshakes and retries Supports Base station broadcast messages to all units Supports Base station broadcast messages to all units Efficient time-slot management scheme for unit responses to reduce probability of collisions and need for extraneous data messaging Efficient time-slot management scheme for unit responses to reduce probability of collisions and need for extraneous data messaging Supports Base station multi-cast messages to up to 15 separate GPS-Mic groups Supports Base station multi-cast messages to up to 15 separate GPS-Mic groups Units may be assigned to groups at time of Unit ID designation and provisioning Units may be assigned to groups at time of Unit ID designation and provisioning Can reduce data messaging and simplify equipment management Can reduce data messaging and simplify equipment management