PDA is a free travel and navigation app developed by Pingvn for Android 9.0 and above. The app currently allows users to track their routes and store their last location in an external storage. It also features a messaging function, but all data is transmitted and stored in plain text without encryption.

PDA's main function is its route tracking feature, which can be useful for hikers and travelers who want to keep track of their journeys. However, the lack of encryption for messaging and data storage may be a concern for some users who prioritize privacy and security. Overall, PDA is a simple and straightforward app for basic travel and navigation needs.