I've got two of these, One for me, one for my girlfriend. They rock and are easy to use.
My Public Service Announcement: If you turn it on, and the battery meter (those two numbers) reads anything less than 30, especially if you've had it in a warm car, REPLACE THOSE BATTERIES. Less than 30 or so is effectively zero...
(dorky explination here: The battery meter is actually a volt meter of the battery. New 1.5v batteries give off like 1.7v or so, older ones give off 1.3 or so. The Tracker guestimates the amount of battery life left on the voltage. The lower the voltage, the less accurate this measurement is.)
Batteries are cheap! Your life isn't! Thank you, carry on.
Also, Don't store the thing over summer with batteries in it.