The geothermal system heats and cools using piping that goes deep within the earth, where temperatures are warmer than outside air in the winter and cooler in the summer.
The dock is suggested to include an FM transmitter for piping navigation audio throughout your vehicle's sound system, as well as allowing external DAPs to be heard through more than just a built-in tweeter, but we're still waiting to see if TomTom plans on this being a standalone unit or if it fits better integrated into one's dash.
Rather than eliminate nitrogen oxide via a bulky chemical treatment system that even the EPA questioned initially, EGR would make the motor do all the work by piping exhaust gas back into the cylinders and burning it again a cleaner, cheaper, lower-maintenance solution, which would set Navistar ahead of the pack.