Once data is loaded into Debrief, there are a number of ways of controlling the view of the track data, but the most efficient way is by using the buttons on the View toolbar:
Figure 2.1. View toolbar
For most of Debrief's operations (such as adding drawing features) it needs to have an area to work with. When re-opening an existing plot file, or importing data, Debrief determines the area covered by the plot from the given data. However, when starting a new, blank session, Debrief doesn't know what area to use and defaults to its own origin at Fort Blockhouse, HMS Dolphin, Portsmouth, United Kingdom: the plot will be centred on 50 degrees 49 minutes North, 1 degree 19 minutes West (approx).