Abstract: Techniques are described for enabling flexible and dynamic creation and/or modification of voice data for a position-determining device. In some embodiments, a voice package is provided that includes a language database and a plurality of audio files. The language database specifies appropriate syntax and vocabulary for information that is intended for audio output by a position-determining device. The audio files include words and/or phrases that may be accessed by the position-determining device to communicate the information via audible output. Some embodiments utilize a voice package toolkit to construct and/or customize one or more parts of a voice package.