From ICAO Annex 6 Part.1
ALL AEROPLANES OPERATED AS VFR FLIGHTS
All aeroplanes when operated as VFR flights shall be equipped with:
a) a magnetic compass;
b) an accurate timepiece indicating the time in hours, minutes and seconds
c) a sensitive pressure altimeter;
d) an airspeed indicator; and
e) such additional instruments or equipment as may be prescribed by the appropriate authority.