I just moved from Texas to California, and I rely on my t650 for directions to get almost EVERYWHERE. I'll often have my directions open while using the speakerphone, but after a while (probably 60 seconds) it switches back to the speakerphone display. This is maddening, not to mention dangerous if I have to get my directions back up while still driving!

So my question is...is there a utility/preference I'm missing that will let me control this auto-switch behavior?