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If the calibrate screen startup sequence is the same as on the 7x5- here is what you do. With your Nuvi off, put a finger on the approximate middle of the screen and keep it there. Slide the power switch to the on position and immediately back to the lock position. At first it looks like a normal startup, but in 30 seconds to a minute you will see the calibration screen where it shows little crosses and says press here. I use an eraser tip to insure my presses are centered.