Inaccurate Locates (Drift)
Drift is any skewing of the locate accuracy caused by an outside factor (not the device itself). Drift is often responsible for false alerts and random locates in the middle of the night.
There are several contributing factors to drift. The most common form of drift is due to interference. When using a vehicle tracker, you will want to be be wary of where installing (see recommendations in Installation Instructions). Thick materials and structures like garages, warehouses, parking structures, tunnels- these will interfere with GPS signals and can cause drift.
When using a PF+, you will also wan to be wary of how it is worn and stored. This way, the antenna can get a proper signal (see User Manual). Backpacks, bags, and purses are okay, but metal or thick plastic containers can cause issues. Being in and around large buildings, heavy foliage, or large bodies of water can cause drift. When in and around buildings, WiFi Touch helps combat drift.
Drift is typically tempoary. If you see a repeated pattern of drift, the three important questions are (1) Where is it at the time of drift? (2) What times do these instances of drift occur (3) How was it being used? With these details, the answer behind the drift can always be verified by a customer service representative so a timely resolution can be reached.
Drift A (Inerference): Any solid material interferes with GPS signals. This will cause the connection to not be as solid and the locate will skew. Once the GPS connection is solid again, the next locate will be more accurate. Our system will post GPS locates that are read as within 50 meters accuracy. If the drift is under that, GPS will remain and the locate will stay slightly skewed until a better connection occurs.
Drift B (Global Drift): Global drift is when you experience a significant incident of the locate skewing (where it is miles, states, even countries away). This is caused by a disconnect from the GPS satellite handing off its signal to a different GPS satellite. Once the connection from the new GPS satellite is reestablished, the next locate will be accurate again.
Drift C -WiFi/ Cell I.D. (PF+ Only): If the PF+ cannot get a good enough GPS signal, it will switch to WiFi/ Cell I.D. If the device is indoors and there is no WiFi, or the there are not enough strong signals for it to triangulate a locate, it will switch to Cell I.D. Cell I.D. means it uses cell towers in the area to triangulate a locate. Unfortunately, cell towers are usually far apart and the locate will not be as accurate as GPS. Wifi Touch is based on triangulation; while more accurate than Cell ID, it is often less accurate than GPS.