How to make Garmin GPS to speak street names.if your Garmin Nuvi 255 does not speak the street names during the real time travel directions, you can update it. For example, it says “Turn left in 500 feet,” if you have the old gamrin nuvi, you need upgrade to a Garmin Nuvi 350 or 360 (older models), or 205 0r 255 (newer models). for example If you purchased a Garmin Nuvi 360 gps, you can make it speak and say the street names with simple steps: …