Found out who makes Rosen

Coagent Electronic S&T Co., Ltd.|MAZDA series|TOYOTA series|HONDA series|CHEVROLET series|FORD series

Rosen is teamed with Coagent, I found that in the FCC database by searching my Rosens FCC ID #

I can't find any info about the Rosen Nav unit, their website just seems to cover Coagent and another of their brand names is Caska.

The Coagent website isn't very useful, you need password to get to the good parts. Looks like it's for their business customers.