Ukucoceka komoya luhlobo lomgangatho wezizwe ngezizwe osetyenziswe kwigumbi elicocekileyo. Ngokwesiqhelo benza uvavanyo lwegumbi lokucoca kunye nokwamkelwa ngokusekwe kwimeko engenanto, eyomeleleyo kunye nendawo eguqukayo. Ukuzinza okuqhubekayo kucoceko lomoya kunye nolawulo longcoliseko ngumgangatho ophambili womgangatho wegumbi elicocekileyo. Umgangatho wokwahlulahlula unokwahlulwa kwi-ISO 5 (iklasi A / I-100), i-ISO 6 (iklasi ye-B / iklasi ye-7) kunye ne-ISO 8
