Anyone know anything about GPS devices?

Here is a Garmin - nüvi 1200 for $129.99 It says, "Turn-by-turn voice prompts". That is street naming correct?

http://www.bestbuy.com/site/Garmin+-+n%26%23252%3Bvi+1200+GPS/9333045.p?id=1218086484830&skuId=9333045

What is text to speech technology?

Ooooh! found it at Amazon for $115.00!