RelaisDB is a mobile database of German relay stations for amateur radio usage. It is helpful for the German radio amateur while on the run. It provides information about relay stations in Germany, which the radio amateur can use with handhelds, QRP devices, and so on.
PrefixDB is a mobile database of callsign prefixes in use by amateur radio. This database is helpful for the radio amateur while on the run. It is especially helpful for portable operations like QRP or handhelds (Echolink, etc.).