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What is the BUGS and the RST function for the A320's ISIS for?

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The RST button is the attitude reset (note the ATT next to the button) function. The ISIS contains an attitude gyro that has to be re-aligned periodically.

ATT RST function
Credit: Smartcockpit.com

The BUGS button enables the BUGS function, which allows the crew to enter speed and altitude bugs on the display. The bugs are a visual identifier to aid the crew in maintaining a speed or altitude.

Speed bug
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Credit: Smartcockpit.com

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