User's Guide

Model: VSM3
16
Positioning Universal, Inc. - Confidential & Proprietary
6 Detailed Moving Interval Reporting Logic
6.1 Moving Interval Locations
Move Interval Location messages are triggered by a time interval after the device has
entered the Moving state. Messages are sent on this time interval until the unit moves into
Stopped state.
If the unit enters a poor GPS area then the Move Location message is populated with the
last good latitude, longitude, satellites, horizontal accuracy. However, the VIN (main
power voltage), battery voltage, IO state, and RSSI are updated to current values.
6.2 Moving Minor Locations
Minor Move Location messages are size optimized messages which are appended to a
Location message representing offsets from main Location message.
If a device enters poor coverage, the minors associated up to the last good GPS location
are reported with next Move Major Message.
If a device receives an Ignition Off then all current minors are dumped with the Ignition
Off message.
However, if a device enters poor GPS coverage and then enters good GPS coverage
during a Move Major timeout, only the minors associated with the current good GPS
coverage are reported. So for example, if a device reports a Major Move then 10 seconds
later enters poor GPS coverage and then 20 seconds later enters good GPS coverage and
stays in good coverage until next Major Move report, only minors for the last 30 seconds
are reported as part of the Major Move.
If a unit moves more than 700 meters between minor locations then all minors are
dumped and the minor location logic is restarted.