Spijkers & Wingtips' heads-up display (HUD) for their MD-500 light helicopter.

A heads-up display (HUD) attachment is usually a control panel widget which contains useful toggles and gauges for controlling an aircraft. Usually these include such features as an altimeter, speed indicator, artificial horizon, and fuel indicator. A HUD attaches to the user's camera so that it’s always visible to the user, but not to others.

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