Questionable data is used to indicate that an operator has reason to believe that the data for a piece of equipment may be incorrect or inaccurate. Selecting the Questionable Data option in the shortcut menu places a question mark in each graphic object representing the tag's data to indicate that the data is questionable. An example of a questionable data display is shown below.

Selecting the Questionable Data option from the shortcut menu places a question mark in the selected graphic object's display to indicate that the data being reported is in doubt.
Note: The Questionable Data option of the shortcut menu is a toggle option; selecting it once turns Questionable Data on, and selecting it a second time turns Questionable Data off. You will know that the questionable data option is on when a checkmark (ü) appears beside it in the shortcut menu.
Instructions on marking and unmarking questionable data using the shortcut menu are provided in the sections that follow.