You are probably aware that the release of the new iOS4 operating system for iPhone and iPod Touch will be available today during the day, via synchronization of your (s) devices with iTunes. For the iPad, il faudra attendre l’automne.
About iNavX, Richard Ray has just written :
iOS 4 should be available tomorrow (21/06/2010). Only apps that are specifically built for iOS 4 pourront tirer parti du multitâche ou du basculement de tâches. iNavX 3.1.0 and later will support this feature.
Patience, therefore…
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[Update September 01/07/2010] iNavX 3.1.0 is available on the AppStore.