Describes how GPS Dead Reckoning provides location information during satellite signal interruptions. It helps users estimate their current position from previously determined position, speed, elapsed time, and course.
Dead Reckoning is a global positioning system (GPS) fallback feature that provides users with location information during satellite signal interruption by calculating the current position using a previously determined position and advancing that position based on known or estimated speeds over elapsed time and course.
For more information about GPS dead reckoning, including feature limitations, see Configuring GPS in the Cisco Catalyst IR1800 Rugged Series Router Software Configuration Guide .