GPS Insight Blog

We are testing out this new tracking device which I mentioned in the past couple articles.

I am trying to lose a few pounds gained from the past 2 trade shows in Dallas (mmm, barbeque…).

So I went on a run today and put the tiny device in my right shorts pocket and headed on my usual route.

Here is the 2 minute-by-2 minute track:

As always with GPS Insight, green means moving, blue means idling (e.g. 0 mph as I start/end the run), and the color and thickness of the line goes from “light and thin” to “dark and thick” to help indicate direction of travel which helps visually determine the vehicle’s (or runner’s) activity more easily.

Here is a different perspective which shows me leaving my subdivision and heading EAST 2 miles then turning around at the main road. Note that the light blue line is much closer to the sidewalk than the line coming back (about 100 feet off). I took the same sidewalk the whole way — what happened? This is where battery life vs. 100% accuracy comes in. 100% accuracy, we are good for 10-12 hours on a charge. But we can go well over 3 days on a charge at 2 minute updates if the GPS unit is allowed to sleep between those two minutes — this generally adds some error to the location, in this case up to 100 feet when I’m not faced toward the satellites.

Well, as I mentioned, I put this tiny tracker in my right pocket and headed East. When I headed back, my body was “in the way” of the GPS signal from the predominant GPS satellites in this area at this time, in the Southern sky. This means they caught a bit of a bounced signal from the houses, trees, etc. to my right. This subtle difference shows up on the map. The accuracy of these units is very good (best case, 5 feet, worst case, 100 feet), considering the GPS satellites are 22,370 miles in space, and the tiny device is in my running shorts pocket (don’t worry, we won’t sell this one, and they are VERY waterproof, fyi…). The moral of the story is they’re highly accurate if you only need them for 10-12 hours on a charge, and pretty accurate if you want 3 days (at two minute updates). If you want less frequent updates, they’ll run up to 10-15 days on a single charge.

Our more powerful vehicle-mounted GPS tracking devices are always within 5-15 feet while driving, and typically within 10-30 feet of accuracy when parked. Either way, that is VERY good considering the standard accuracy of a single GPS fix is 9 meters in any direction. This is because only the US Military gets the “100% accurate” signals — for the rest of us it’s only guaranteed within 27′. However, the more samples you take in a given period of time, the more accurate you can become by eliminating the really far off samples. This is a topic for another day. Thankfully, our customers aren’t harvesting grain or painting road lines based on our “civilian” GPS. We don’t cost nearly as much either (trust me).

So to use Google Earth to its fullest, I outlined the path I ran and measured it to be 4.59 miles (I’m getting tired as we speak…):

[Nice mini-racecar track my neighbor has, huh? Unfortunately I don't know him...]

I can run a quick activity detail report for my rough speed while running (along with a “12 MPH” which is bad — it’s due to my going into the house & losing GPS signal which can cause a transient issue with this unit (currently, we are programming it to be less likely once we sell them).

Anyway, that’s some of what you can do with our new small, rechargable EZ-1000. (shown below):

By the way, did I mention it was 85 degrees today here in Scottsdale…? A little hot for a run already (sorry everyone back in the Northeast & Chicago)

Thanks,
Rob.