Limited GPS Signal & Mobile-Phone Triangulation
Poor GPS signal occurs when MyBeacon cannot ‘see’ the satellites from which it works out the location.
Provided the person is outside, this is rarely a problem. my beacon does not reliably work indoors. Other factors that can disrupt the GPS signal include being in a car, areas with very tall buildings, forests with tall trees and, rarely, adverse weather conditions.
Mobile Phone Triangulation can be used on the rare occasion that a satellite signal cannot be received. It is almost always possible to get a location by triangulating the position against masts of the mobile phone network. However, this has limited accuracy but it will let you know to the nearest 10 km where the patient is, and can sometimes be more accurate than this.
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