A security’s “expected move” represents the one standard deviation expected range for a period in the future. Most options are priced according to this formula. A one standard deviation range encompasses 68% of the expected outcomes, so a security’s expected move is the magnitude of the future price movements with 68% certainty.
The Navigator Algorithms incorporate the expected move of the S&P 500 index and automatically adjust overbought and oversold as these levels are approached during the week.