User Manual

TrackerPAL™ Operations Guide

RemoteMDx, Inc.

Page 6

3 Features & Limitations

The section describes the features and limitations of this release of the Offender Tracking Device (OTD) units.

3.1 GPS Locations

The unit intermittently monitors its location using the Global Positioning System (GPS) network. It can be

expected to acquire and maintain a valid fix whenever it is in direct line of sight of a minimum of three to four

GPS satellites with sufficient signal strength. Various environmental factors may interfere with a location fix,

which may result in position error or the inability to acquire a valid position.

3.2 Voice Calls

The unit places and receives voice calls over the GSM (Global System for Mobile communication) cellular

network, operating as a type of speaker phone using a built-in microphone and loudspeaker. Outgoing voice

calls are to predefined phone numbers, and incoming voice calls are from any landline or cellular telephone.

The same service limitations which one experiences with standard cell phones will also be experienced with

these units.

3.3 Data Transmission

The unit transmits and receives information to and from a specified server on the Internet by way of the GSM

network, using GPRS (General Packet Radio Service). This information includes unsolicited messages from the

OTD, such as GPS location records and alarm notifications, as well as configuration data and remote alert

commands sent to the OTD from the server.

GPRS cannot operate simultaneously with a voice call. Therefore, SMS is used for the transmision of all traffic

between the unit and gateway when a voice call is in progress.

The unit is commissioned with a particular SIM (Subscriber Identity Module) card and on a particular cellular

provider's network/sub-network. Neither the use of an alternate SIM card nor roaming to a different cellular

network/sub-network are supported at this time.

3.4 Remote Alert Commands

The unit can be remotely commanded to issue both an audible alert event and a vibration alert event.

3.5 User Interface

The unit can communicate in a variety of information and modes to the wearer through the speaker, the vibration

motor, and the three indicator lights: Power (red/amber/green tri-color), Alert (red), and Call Status (red).