Comparison Between SCRAM GPS Devices

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The following table compares common features and functions between the SCRAM GPS device and the new SCRAM GPS 9 Plus device:

WARNING: In “Economy” mode, the battery life of the GPS 9 Plus device is extended, however, the accuracy of location points is degraded. This feature is NOT recommended for use with high-risk caseloads.

Feature / Function	SCRAM GPS	SCRAM GPS 9 Plus
Model Numbers	GPS700 (ATT)	GPS900 (ATT) GPS910 (VZW – future) GPS920 (EU/UK) GPS930 (AU)
Serial Numbers	“GL” series	“GM” series
Battery Life	24-40 hours	Up to 60 hours in Optimized mode* Up to 80 hours in Economy mode*
Battery Charging Time	Dead to Fully Charged: 3 hours	Dead to Fully Charged: 3.5 hours
Battery Charging Cable Connector	Connects to the device by sliding from top-down or bottom-up.	Connects to the device by sliding from bottom-up only until wear-in is complete, then allows from top-down as well.
Device Lights (physical attributes)	May be small and rectangular (original form factor) May be large and round (refreshed form factor)	Large and round
Device Lights (behavior)	Slow blinking red indicates low battery Blinking green indicates charging Solid green indicates fully charged	Quick blinking red indicates low battery Blinking green indicates charging Solid green indicates fully charged
Device Vibration	Immediately vibrates for one second when plugged into or unplugged from AC power.	Vibrates for one second when plugged into AC power, but there may be up to a 30-second delay when battery is dead. Vibrates for one second when unplugged from AC power and battery is sufficiently charged. Vibrates for 30 seconds when unplugged from AC power and battery is low.
Onboard Zones Storage	10 total Inclusion and Exclusion Zones, including one Home and one Work Circular zones only	Up to 100 Inclusion and Exclusion Zones, including Home and Work Circle and rectangle zone shapes supported
Store-and-Forward Capacity	Device will store approximately 2.5 days of location-point, message, and alert data while out of communications range.	Device will store approximately 17 days of location-point, message, and alert data while out of communications range.
Alert Management	Alerts must be resolved on the SCRAMNET GPS Dashboard by an agent.	The following alerts can only be resolved by a corresponding “Clear” event received from the SCRAM GPS 9 Plus device itself: Strap Tamper Device Tamper No Motion* Possible Cellular Jamming* Potential Dead Battery
Communication Protocol	User Datagram Protocol (UDP)	Message Queuing Telemetry Transport (MQTT)
Communication Network	3G GSM (GPS600 series) or 4G LTE (GPS700 series) wireless cellular network, depending on device	4G LTE-M wireless cellular network
Location Determination	Calculated based on one of the following (in order of availability): Data from two global positioning satellite constellations Cell Tower Point (CTP) triangulation	Calculated based on one of the following (in order of availability): Data from three of an available five global positioning satellite constellations Wi-Fi assisted positioning^† Cell Tower Point (CTP) triangulation
Location Accuracy (Average)	Radius of 29 feet (8.8 meters)	Optimized: Radius of 16 feet (4.9 m)* Economy: Radius of 42 feet (12.8 m)*

*When enabled at the Account level.

^†The SCRAM GPS 9 Plus device does not connect to a Wi-Fi router to acquire a location point. Rather, it simply detects the Wi-Fi “access points” in range, like the way a smartphone shows the list of available Wi-Fi networks. Companies such as Google, Microsoft, and others, maintain a database of routers and their locations. At least three (3) Wi-Fi access points are needed to acquire a location point. The company providing the location service triangulates the provided list of Wi-Fi access points to return a location point with a Latitude, Longitude, and Accuracy value. Other properties of GPS location points – such as number of satellites, speed, and direction – cannot be provided with a Wi-Fi location point.

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