On Ipads you'll see both map view and radar/tach view. On phones and android devices you'll see map view by default. To view radar/tachometer you need to click the upper right corner of the small map view. The map will be replaced with radar/tachometer.
This radar view sounds pretty cool. Anyone up to the task of a "how-2" with screenshots?
I was a little fuzzy on the description above with circles and areas and such.
Might even be sticky worthy.