This realization was impressed on me the other day when a new address plaque for our house was delivered, a present from my spouse. On it was printed not the street number of our house but its precise Latitude and Longitude. Even those coordinates which I had used in poring over maps in high school geography classes long ago to locate faraway cities had been modified: instead of degrees, minutes and seconds, the Latitude and Longitude were stated in degrees followed by the decimal equivalent of minutes and seconds. Pinpoint accuracy. To check it out I entered those coordinates into Google Earth and there instantly appeared a satellite view of my roof with a pin stuck into it..
I wonder how long it will be before the mail service begins to accept addresses stated in terms of GPS coordinates in addition to traditional street number addresses. Think how fast an electronic sorter would help distribute the mail using that system.
Already “Location Based” services have become universal. Often my iPod Touch will flash a message that a certain site requests that I permit it to use the Location Service of my device when all I wanted was a general weather forecast or the news.
Every item I order on the net is accompanied by a tracking number that enables me to follow precisely and in real time the movement of say, a laptop, from its manufacturer in China, though its transfer to another air freighter in Alaska and on to a truck in California. I have learned the names of forlorn truckstops in small towns somewhere out in the Midwest where my package was transshipped in the middle of the night. When I hear that jumbo air freighter throttling back right over my house at 3:55 am every dawn on its final approach I have a pretty good idea that my package is going to be at my doorstep when I wake up because I had tracked it being onloaded at that forwarder’s hub in Memphis thousands of miles East earlier in the night. And all of those logistics were using GPS coordinates, not street numbers.
All of which has prompted me to think: What if I followed that line of Latitude that runs right through my house all around the world, 16,517 miles, back to my house? (Click on arrow to start movie clip)
My geography lessons always defined Latitude as “an imaginary line” but for me 47°N begins as a very real line, a narrow path up a low berm across the street from my front entrance that disappears into a stand of trees. I have often thought of travelling around the world and I have even planned such a trip several times using the conventional way of checking airline routes and schedules and fares, flying in a zig zag route from major airport to major airport following the logic of the air travel business.
But now I am going to find out what lies straight ahead over the horizon as I look due West through my front window and follow footpath Latitude 47°N (approx.) beyond those trees.

Except for the first thirty minutes or so as I walk along Latitude 47°N to the water’s edge at Puget Sound I will be doing most of my travel at my computer using Google Earth. Can’t blame me: how would you like to trudge through Mongolia, or vast expanses of Central Russia, which to my surprise I discovered are directly beyond those familiar trees outside my front window, over the horizon, across the Pacific, on the other side of the International Dateline?
Following Latitude 47°N to the water's edge at Puget Sound:












