A portable fitness device includes a global positioning system receiver that receives GPS signals, a wireless wide-area network transmitter supporting communication over-the-air to a wireless communication network, and a processing unit coupled to the GPS receiver and the wireless wide-area network transmitter. An unknown airport advisory is generated and broadcast after the aircraft is in a landing configuration, when the aircraft is greater than a threshold distance from the nearest landing site in the database, but before the terrain alerts are broadcast. A photoelectric element and a driver chip are located on the substrate. The server is also configured to process the received information and transmit information to the user device regarding whether the initiation fee insurance application has been accepted or rejected. User throughput over a resource reuse set can be estimated, and an iterative method can be employed to reallocate users with poor spectral efficiency to reuse sets exhibiting high throughput to optimize overall throughput in a wireless network or a portion thereof.