Method for determining a navigation solution of a navigation system having a terrain-navigation module and a navigation system

process for determining a navigation solution of a navigation system a Terrain Navigation ModuleDetermining a navigation solution (1), a supported position solution (1a) and the relative heights between two measurements covered Path (1b),Determination (M) a quality (14) of the current supported Position (1a) from the current supported position (1a) by means a first quality function,education (H) a search area and formation of predetermined positions (7) within the search area, determining (K) a comparison position (8) for each a position (7) within the search area, and in each case a stored relative covered Path (10),Determination (P) of a quality of a respective stored relatively covered Path (10), a quality (16) each having a stored terrain heights measurement (11), a grade (17) each a reference height (6)Determination (V) of the quality the position support (4b) via a Function of all minimum probabilities (20) of all employed Position (7) in the search area and the support in the strap-down module (C) determined navigation solution on the Navigation filter (D) with the aid of the determined position support (4a) and the specific quality <?page 2?>of the position support (4b)and navigation system with a strap-down module and a navigation filter and with a terrain navigation module for determining a navigation solution.