typo fix 
typo fix 

speedchage -> speedchange
CNA-Bld/ElectronicObserver,herix001/ElectronicObserver,andanteyk/ElectronicObserver,tsanie/ElectronicObserver,RadarNyan/ElectronicObserver,kanonmelodis/ElectronicObserver,yukun0406/ElectronicObserver,fin-alice/ElectronicObserver,CNA-Bld/EOE-Sandbox,CAWAS/ElectronicObserverExtended