Telenav for T-Mobile Supported Devices: v5.2 for Samsung T919 Users Guide - Manual (Page 29)

Audible Guidance Tones
TeleNav GPS Navigator delivers audible guidance tones (beeps with a recognizable pitch) as you drive, in addition
to spoken audible directions. A preparatory audible tone is typically heard no less than 30 seconds before reaching
a turn, and an action audible tone is typically heard no less than 10 seconds before reaching a turn. The
preparatory audible tone may not be sounded if the distance to the next turn only allows time for the action tone.
The lead times for the audible guidance tones are increased proportionally to your driving speed. For example, this
allows more time for changing lanes before a turn if you are driving at highway speeds as opposed to driving more
slowly on local streets.
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