What is the Difference Between Real Directions, Real Voices and TTS

Devices with "Real Directions" will speak not only the street names but will also use recognizable landmarks, buildings, and traffic lights in the notices. This minimize the need to locate and read upcoming street name signs. What you might hear would be: "In 500 feet, be in either right lane, then turn right at the stoplight." Note that Garmin Real Directions is only available in North America, Europe, and Australia

Devices with "Real Voice" will say something like: ""In 500 feet, turn right on Main Street." This is similar to what we know as "Text-to-speech" (TTS) voices, but Garmin claims that Real Voice uses refined speech technology to provide spoken instructions using a voice that sounds more realistic and friendly.

Garmin Real Directions with Garmin Real Voice is available on the following (as of Jan 2015)
nuvi 57, 58, 67, 68, 2407, 2408, 2507, 2508, 2509, 2609, 2707, 2708, 2709, 3507 and 3508 series ; dezl 570, dezl 770; and the RV 760

The following devices have only Real Voice (not real direstions)
nuvi 55, 56, 65,and 66

Also note that Garmin Real Directions and Garmin Real Voice are only currently available in certain languages:

Voices with both Real Directions and Real Voice
Danish - Ida
Dutch - Claire
American English - Samantha
British English - Serena
European French - Virginie
European Spanish - Monica
German - Anna

Voices that only speak Real Directions
Arabic - Maged
Czech - Zuzana
Czech - Xander
Dutch (Belgium) - Ellen
Australian English - Karen
Australian English - Lee
British English - Daniel
Indian English - Sangeeta
American English - Jack
European French - Thomas
German - Yannick
Italian - Silvia
Italian - Paolo
Norwegian - Stine
Polish - Agata
Russian - Milena
European Spanish - Diego
Swedish - Alva
Swedish - Oskar
Turkish - Aylin