If you enjoy APRS (the Automatic Packet Reporting System) in US and Canada this device will make your life easier. All you need is the tiny board, your radio and an Android phone.
Introducing the Mobilinkd Bluetooth APRS® TNC. With your radio, your Android phone and this TNC, you have everything you need to get started with APRS — all at a fraction of the cost of a dedicated APRS® radio, and with a better user interface than any APRS® HT on the market.
Mobilinkd – Highly mobile packet radio – [Link]