A variometer is used to measure the variation of the field components about baseline values, in a continuous and unattended way, at the required sampling rate, say 1/minute.

What is a Vario paragliding?

Varios are flight instruments which indicate your height whilst you are paragliding. They range from super basic beepers indicating ascending or descending movement to onboard computers which can track your flights, sniff out thermals and even warn you of restricted airspace.

What is the purpose of vertical speed indicator?

A Vertical Speed Indicator (VSI), also known as a Rate of Climb and Descent Indicator (RCDI) is an instrument which indicates the rate of climb or descent of an aircraft.