Exploration Guides

We're all explorers. You just need the right guide.

Help: GPS Navigation

The GPS system in your hand is receiving signals from a set of about twenty-four satellites orbiting the Earth. At any given time, there is usually between eight and twelve in the sky (the rest are hidden by the Earth). Each satellite constantly broadcasts its exact location and the exact time. By comparing the times, and using the locations sent, it’s possible to calculate, more or less, where you are. You need a bare minimum of three satellites to have any chance of calculating a location. Five or more is better.

When you look at the accuracy shown on the fourth line of the Current Location given in the upper-left corner of the screen, if you see an accuracy of between two and five meters, that’s probably as good as you can get. If it’s a lot higher than that part of the sky is probably blocked by something the fairly weak GPS signals can’t penetrate. Trees and clouds don’t cause much interference, but buildings, cars, hills, and cliffs do. If your GPS accuracy is too low, look around for a better view of the sky.

No comments yet.

Leave a Comment