The Etak Navigator was a revolutionary vehicle navigation system launched in 1985, which used a combination of dead reckoning, map matching, and sensors to provide location information. It was the first practical vehicle navigation system and was considered groundbreaking at the time. The system used a vector CRT display, cassette tapes for data storage, and a complex algorithm to match the vehicle's position to a digital map. The Etak Navigator was expensive, with a price tag of $1,395, equivalent to around $4,000 today.