How does the "H" measure the altitude

[Photo]

Hi, how does the H measure its AGL / ASL altitude? Through air pressure or sonar or...?

 

[Shadowolf]

Pressure.

 

[rdonson]

Pressure.

That’s not likely to be very accurate.

 

[Shadowolf]

That’s not likely to be very accurate.

My statement or the sensor?

 

[PatR]

The H uses a pressure altimeter as the primary altitude reference. Do not depend on it to be accurate. It’s common for it to be off anywhere from zero to 50’. GPS, when satellite count is sufficient, is a secondary source but has a several meter CEP.

 

[rdonson]

My statement or the sensor?

Sorry, the sensor isn’t likely to be very accurate although I could be wrong.