In this work algorithms for indoor positioning systems based on received signal strength are presented. These algorithms include some traditional methods which were already described in literature, and similarly new, based on the models of the multipath channel models. The indoor positioning systems based on received signal strength can be classified by followings parameters: method of Pattern recognition, coordinates determination algorithm, expansibility of algorithm and other parameters. In this work classification it is based on the location algorithm and recognition of template. Algorithms, results of calculations and location error distribution function are similarly resulted. Basic positive and negative parts are considered for each of the presented methods of decision of navigation tasks.