The instrument panel is fitted with an airspeed indicator, altimeter and vertical speed indicator, a magnetic compass, turn indicator, ignition switch and fuel pump.
en.wikipedia.org Airspeed and heading can be measured with a fair degree of accuracy using onboard measurements, namely the airspeed indicator and gyrocompass.
en.wikipedia.org With one engine stopped, its ground speed was about 40 mph (64 kph) and airspeed was reduced by around 4 mph to 58.7 mph.
en.wikipedia.org This allows a glider pilot to lose altitude without gaining excessive airspeed.
en.wikipedia.org The instrument panel housed fuel pressure, oil pressure and temperature gauges, a clock, altimeter, tachometer, airspeed indicator, bank and turn indicator, and liquid magnetic compass.
en.wikipedia.org