Google Map DF Display

I need a C# application to work with Google Maps. The app will have two inputs one from a bluetooth GPS receiver providing a NEMA location string on one com port and another com port giving a magnetic heading. I need a map with the received location at its centre, a zoom facility would be useful and a line drawn from this centre point with the magnetic heading. For example if 180<CR> is received on the com port the line will be drawn directly down from the reference point, 270<CR> horizontally and to the left etc. This is needed for a demonstration of a radio direction finding system. If this is successful, the next, fully funded, phase will be to add a second location so that the transmitter can be triangulated and tracking for the location