Jan Miksovsky reviews the user experience of a Garmin GPS unit.
“Clear screen organization, with careful use of color, shape, contrast, and typography to define a hierarchy of screen elements. Consider that in the above image they’ve made the “200″ in a significantly larger font than the “m” (meters) unit that follows it. Moreover, they’ve top-aligned the “m” unit to maintain the legibility of the much more important number. In this particular application, it’s critical for the user to be able to glance down at the screen and get a sense of how far they have to go until they need to turn. That is, if they see three characters, they know they have hundreds (3 characters) of meters left to go, not thousands (4 characters).”
Link: Approachable UI package in Garmin Nuvi GPS (miksovsky.blogs.com)