Clear Channel signed a similar agreement last week with Nav N Go, another software provider (read details here).
Horizon has a long track record in software navigation. Its NavMate software has been powering navigation solutions in the USA since 1989. In June 2007 teh Santa Clara, California company sold its patent portfolio to TomTom for $29 million (read more here). Horizon currently provides its NavMate software to in dash, portable, and Smartphone platforms.