I drove my daughter to Logan many years ago and used voice commands on my Garmin Nuvi to get me there. When we got to 495 (from Rt 3), I noticed that it said that I should drive 80 miles on the highway. Of course that would put me in the Atlantic Ocean. I had her reboot the Nuvi and re-entered the route and it gave us the correct routing. In general, I will map out a long route on Google Maps to estimate time and to take a look at the expected level of traffic and then put in the destination in the car for the Nuvi.