eth- ods the best possible accuracy is 100 metres. Note also that satellite- and network-based technologies differ in relation to their accuracy in different environments. The GPS sys- tems require a clear view to the sky, SO the best accuracy cannot be reached in dense city areas. Cell-based methods have the reverse accuracy behaviour, the highest accuracy being reached in city areas and the lowest in rural areas. This is because cell-based methods are dependent on the cell size. Among the services introduced in the first section of this appendix, the highest accu- racy is needed for navigation services. Very high accuracy is a requirement when giving detailed navigation instructions. Information services and advertising are not that sensi- tive with regard to positioning accuracy, SO less complex systems can be used to provide them. Availability Remote Satelite-based technologies Network-based technologies (AGPS) Rural Cell I.D. E-OTD or Suburban Urban/City Indoor Underground Accuracy [m] Figure C.3 Accuracy of the location positioning methods LOCATION-BASED SERVICES C.5 NETWORK PLANNING ASPECTS Network planning aspects are relevant for the network-based and hybrid location positioning methods. In the mobile-phone-based methods the location estimation is totally handled by the MS, SO no changes to the network are needed. In addition to network planning, also some general SMLC and GMLC setting needs to be made to enable the location-based services in the network, and these settings affect also the mobile-phone-based methods. The settings are vendor-specific, so they are not described here. The LBS network planning procedure consists of three steps: network planning for LBS implementation LBS operability and system accuracy verification. In the first step the needed changes to the network are defined and planned. Then implemen- tation means that the planned changes are transferred to the network. After implementation, the operability is tested and the positioning method accuracy is verified with measurements. Onl