Turbulence Detection activates a feature that detects and displays severe turbulence. This feature requires an unlock that must be purchased to be displayed on the GTN-7XX series units. Turbulence Detection is inactive at ranges greater that 160 NM. If Turbulence Detection is enabled and available, Turbulence Detection will be reported as Inactive in any of the following conditions:

• Scan orientation is not Horizontal
• Scan range is greater than 160 NM
• Radar mode is not Weather