Hi This is my second attempt to create a navigation program, the first one was OK but had some bugs. The attached one is much better and, so far, has proved to be accurate! It is based on an excellent article by Ed Williams called Aviation Formulary V1.43 - if you are interested in navigation, suggest you download it. My (attached) program includes a number of features I have 'borrowed' from the formum including Loading an INI file and also for simple database manipulation. Thanks guys. I have included a sample database which has some 'real' data at my home port. Hope the program is of some use to somebody!