I’m normally a map, or a map-and-compass, kind of guy. But when I rented my car in Portugal I also rented a navigation system. Getting lost in obscure foreign parts where I didn’t speak the language was definitely getting old.

The man who set up the navigation system for me at Europacar wanted to know whether I wanted British or American English, and also whether I wanted the Jack or Samantha voice. I picked Samantha.

In some respects, Sam is a navigational prodigy, getting me places on a wing and a prayer that I would never have accomplished on my own. For example, the route Sam took me on to the door of my hotel in the historic district of Porto involved several one-way alleys, numerous roundabouts, the lower deck of the famous bridge in Porto, and—strangely—a vacant lot.

When she’s good, Sam is very, very good—but the price for her help is that she wants control. Occasionally she also gets things wrong, directing me up roads closed to traffic, or alleys that are only intended for foot traffic. In these cases, she gets repetitive, and there is clearly a shrillness to the directions, as if she’s asking, “Why can’t you even follow simple instructions?”

She’s also not very sympathetic to the stops I make for photography. She calculates an arrival time for each destination. Apparently, my photographic stops throw this off. “Recalculating,” she announces, and you can almost see the virtual eyeball rolling. “You are now fifteen minutes later than the original time-to-destination.” It certainly sounds like she gets more annoyed the more photographic stops I make.

Once today I reached a new highway that wasn’t in Sam’s database. Her display showed me and the car rolling across open fields, and her directions to correct my course were increasingly implausible, until at last the real world and her maps coincided again, and there was peace in the relationship once more.

Like any neurotic relationship there are communication problems, and as I mentioned, a battle for control. But I’ve grown accustomed to the strident, dulcet tones of my Samantha, telling me she is recalibrating, and to go right in 100 meters on a street whose name in Portuguese she has totally mangled—or often, turn in 250 meters on “Road” with no other name. It’s relaxing knowing I can blunder anyplace in this country, more or less, and Sam will get me to where I need to go no matter how lost I am.