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\section{Prototype}  \subsection{Early Prototype}  The early prototype for the application made use of the Android SurfaceView, a View (classes for dealing with user interface and interaction) for drawing graphics onto the screen.   Two concurrent prototypes were created to test two different proposed implemetations.  \subsection{Canvas Prototype}  The canvas prototype for the application made use of the Android SurfaceView, a View (classes for dealing with user interface and interaction) for drawing graphics onto the screen.   This  prototype took in image files that were placed in the resources folder, and decoded them into Bitmap objects that could drawn onto the SurfaceView using the Canvas, which holds the drawing calls. The Canvas was then used to draw the map background, and an arrow was drawn on top of that background.  A Thread was used to keep the graphics being drawn without it taking away processing from the user interface, so the application would not become unresponsive.  The Canvas was also used to draw a rectangle in the corner of the screen, where text would be displayed to display the score.  Problems were encounteredearly on  with this prototype, as bonerbonerboner the limited amount of memory available for Android applications made it a problem to load a large map file. One of the alternative fixes would have been to use multiple image files and have them programatically stitched together inside the application itself. This proved to be a big problem and