A Caralluma extract and a method of making thereof which can be standardized and reproducible, and which prevents the glycosides from decomposition, which can reduce the undesirable non-glycoside components. A route calculation program adapted to find at least one solution route, between a first location and a second location on a road network, identifies a segment with a first node and a second node in the road network. A variable signal level attenuator in each path attenuates the amplified signal and receives current from current sources.