MARTIN is a graphical user interface developed as part of the Global Challenges Research Fund (GCRF) African SWIFT (Science for Weather Information and Forecasting Techniques) project. MARTIN was originally written by Alexander Roberts (NCAS and University of Leeds). MARTIN allows users to open imagery and navigate backward and forward in time through forecast and analysis imagery for a wide variety of variables. An annotation layer allows users to draw directly into the GUI to highlight particular features while allowing the background image to the changed to a different variable, model initialisation or forecast lead time. Imagery with transparent backgrounds (such as streamlines) can also be added to the annotation layer to produce figures with multiple variables. When all annotations have been completed the resultant image can be saved as a single image.