A method of operation of a navigation system includes: determining a travel context based on a travel condition; determining a guidance landmark based on a candidate landmark; and generating a navigation guidance with a control unit having the guidance landmark suited for the travel context for presenting with a device. A system practicing the method identifies idle speech recognition resources and establishes a supplemental speech recognizer on the idle resources based on overall speech recognition demand. The fast response eject module has a tray control module for detecting a status of the eject button, and an ejection detection module for controlling the ejectinginserting of the CD tray according to the detected status of the eject button after the CD player is powered up and before the front-end module starts to work. The system may determine whether the multiple updates are consistent with the applicable time constraint. The piece of material can also include a heat sink for transferring heat from the LEDs to air via convection or air flow. The invention includes, in one embodiment, a waterproof radio receiver embodied in a helmet.