Dead reckoning (DR) is the process of estimating one's current position based upon a previously determined position, or fix, and advancing that position based upon known or estimated speeds over elapsed time, and course. While traditional methods of dead reckoning are no longer considered primary in most applications, modern inertial navigation systems, which also depend upon dead reckoning, are very widely used.

Dead reckoning is a “backup” feature that allows a vehicle navigation system to continue estimating your location in situations where it’s unable to receive signals from GPS satellites.

The location calculated by dead reckoning usually become less accurate the longer you go without GPS reception.

Go to Dead reckoning GPS RDR-3300