I have found out who makes the navigation system. There is an Odyssey web page with this info:

"The Honda Satellite Link Navigation system uses GPS satellites, a gyroscopic compass and a DVD-based map database to determine location, direction, and approximate speed. The system is very similar to the one used in 2000 Acura models, and is the first DVD-based system, covering the entire continental US on one disc. The hardware is manufactured for Honda (with custom Honda features) by Alpine (http://www.alpine1.com/promo/nav_0_1.html), and the map database comes from Navtech (http://www.navtech.com/), who produces the map database for virtually all navigation systems that provide turn by turn directions to the driver. The system has an integrated TFT touch screen color display that allows menu choices, shows maps, upcoming turn information, and other information."