For a Human Design Bodygraph chart only the longitudinal position of the planets and points are used to derive the info, not the latitude. So the data input only needs the correct time zone. I have used the Human Design software by Chetan Parkyn and achieved exactly the same planetary position results as this app. Admittedly the app is limited as a fully comprehensive professional tool, but for a beginner it is an excellent introductory start. The developer welcomes feedback and suggestions, so dont write this app off yet. Simply email the developer as I have done and submit your wishes and requirements. Loving the graphic design of the Bodygraph design by the way. A refreshing change from the usual style that is normally seen.
Work needed on it yes, but it has a good, solid foundation to build on.