From PDA Essentials:
From the developer:
"The first PDA level simulator that will allow you to work through simulations to help you learn the intricacies of VOR, DME and ADF navigation and accurately convert needle positions to precise aircraft location on your navigation charts. Learn VOR, DME, and ADF navigation. The program features an unlimited number of scenarios to create and be tested on, real-time movement, both a simulation and knowledge test mode, integrated usage statistics, accurate instruments that resemble those found in an aircraft."