How to initialize Your GPS Tracking Device

Your GPS Tracking Device now has power, so it’s ready to go, right? Well, almost. After you put batteries in your GPS receiver and turn it on for the first time, don’t expect it to instantly display your location. A GPS receiver first needs to go through an initialization process before it can tell you where you are. The type of initialization and the amount of time it takes depends on what information the GPS receiver has previously received from the satellites and when. The process is mostly all automatic, and you don’t need to do much as your GPS receiver starts up and begins to acquire satellites. Your GPS user manual may contain model-specific initialization information.

To initialize a new GPS receiver, take it outside to someplace that has an unobstructed view of the sky (such as a large field or a park) and turn on the power. (You did install the batteries first, right?). After the start-up screen displays, the receiver will begin trying to acquire satellites. It can take anywhere from 5–30 minutes for the GPS receiver to gather enough satellite data to get a position fix for the first time (usually more toward the 5 minutes end of the scale). Don’t worry; your GPS receiver isn’t going to be this slow all the time. After the GPS receiver is first initialized, it usually only takes 15–45 seconds to lock on to the satellites when you turn it on in the future.

Ephemeris data (precise position of individual satellites)

If some or all the data is missing or out-of-date, the GPS Tracking Devices needs to get updated information from the satellites before it can accurately fix a current position. The types of data that are outof-date or missing determine how long the GPS receiver takes to initialize. If the GPS receiver is brand new, out of the box, several hundred miles away from where it was last used, or has been stored for a prolonged period of time, initialization will take longer.

Try moving your GPS receiver to watch the satellite signal strength change. If signals are weak or you get a message about poor satellite coverage, move to another location and change the position of the receiver to better align it with the satellites that are shown onscreen. If you’re successful, you’ll see new satellites acquired, the signal strength increase, or both. The more satellites you acquire and the stronger the signals, the more accurate your receiver is. 

Holding the GPS receiver properly will optimize signal reception. If your Electronic Tracking Device has a patch antenna, hold it face up, parallel to the ground. If your GPS receiver has a quad helix antenna, hold it straight up so that the top of the receiver is pointing toward the sky. Chapter 3 covers the differences between patch and quad helix antennas.

After the GPS receiver gets enough information from the satellites to fix your location, the screen typically displays an Estimated Position Error (EPE) number. Based on the satellite data received, this is the estimated error for the current position. The smaller the number displayed, which will be in feet or meters, the more accurate your position.

Estimated Position Error (EPE) is a bit confusing. If you see an EPE of 20 feet, it doesn’t mean that you’re within 20 feet of the actual coordinates. You’re actually within up to two times the distance of the EPE (or even more) from the actual location. For example, if you have an EPE of 50, your location could be 1–100 feet of the actual coordinates. EPE is not a maximum distance away from the actual location; it’s only a measurement estimate based on available satellite data. To complicate things even further, different GPS receiver manufacturers use different formulas for determining EPE, so if you set three different GPS receiver brands next to each other, they all display different EPE numbers. Some manufacturers are conservative with their numbers, and others are optimistic. Don’t get too caught up with EPE numbers; just treat them as ballpark estimates — and remember, the smaller the number, the better.

More information at http://www.jimilab.com/ .