We went hands-on with the service at an OnStar demo in New York City, tracking vehicles in both New Jersey and Detroit. Family Link was able to locate a connected truck in Detroit in a mere five seconds, zeroing in on the vehicle's precise location at OnStar HQ in Michigan (note: we had tracked another vehicle in New Jersey a few minutes before -- that time with a roughly 20 second delay). It's not designed for constant tracking -- you won't see the car icon moving down the map as you drive -- but it appears to be an excellent solution for keeping tabs on your kids as they drive OnStar-equipped vehicles. We also took a look at those handy text vehicle location alerts, that OnStar will push directly to any mobile device or email address at user-selected intervals. Jump past the break to see our hands-on with both Family Link components.