This document presents the design and the development of a software called RAPIT (RNAV and APV Procedures Integration Tool), with the objective of making easy and to speed up the obstacle’s assessment task involved when designing instrumental navigation procedures. The program allows creating surfaces to identify obstacles, by means of some basic CAD tools, and it has an algorithm for the detection of the penetrating obstacles, taking into account natural and artificial ones. Moreover, the program is able to manage a database of obstacles, airports, waypoints, navaids, etc. The main goal of the program is the definition of RNAV-APV procedures, even though its flexibility allows the use into any type of conventional navigation procedure. RNAV procedures allow flying approaches and instrumental arrivals for the different airport operators when unfavourable meteorological conditions exist. Currently, instrumental operations are only possible in big airports equipped with expensive radionavigation systems. With the use of the GNSS system it could be defined RNAV procedures into secondary aerodromes which nowadays are basically operated in visual conditions. RAPIT has been implemented starting from a basic and open source code corresponding to a cartographical map visualizer. From this point, some tools and specific modules to resolve the different needs that are required in the design of a RNAV procedure, have been added. The cartographical Catalan data has been provided by the Catalan Cartographic Institute (ICC). The cartographical coordinates were in ED50 datum and using UTM projection. On the other hand, for aeronautical operations is mandatory working and publish all the coordinates in WGS84 reference system. For that reason, one of the most important parts of this project is focused into the coordinate’s transformation between both datums. For testing the program, in this project it has been drawn the limitation obstacle’s surfaces (defined in the ICAO’s Annex 14) for Girona’s airport and the infringing obstacles have been identified. On the other hand, a whole RNAV-APV approach procedure for Igualada-Odena’s aerodrome (Anoia) is designed by using RAPIT