Originally Posted by Craneguy
Those were the first 2 results from a Google search. The first one looks pretty good.
Copilot looks pretty good too; I just wish they covered Mexico.
Edit: Just found another: Sygic. Fully offline and uses TomTom maps.
I use Sygic on an S2 (mounted on the tripples via Ultimate Addons case/mount) and so far it worked great on over half dozen 2500-4000km trips...
I would suggest breaking the route into day trips and planning by selecting start/end points and then adding 'travel via' points (my routes aren't typically direct :) )....
Nice option (for road bikes) is ability to avoid dirt roads as part of route planning...