Final answer:
An altimeter indicates the height above a reference point, such as sea level. In this case, the altimeter indicates 11,800 feet, which is true.
Step-by-step explanation:
An altimeter is a device used to measure altitude. It indicates the height above a reference point, which is often sea level. In this case, the altimeter indicates 11,800 feet. Therefore, the statement 'This altimeter indicates 11,800 feet' is True.