Dot vs Directional Arrow
In an unusual twist, the latest update to Google Maps for Windows Mobile appears to support the digital compass in the HTC HD2.
With the update in place the Google Maps My Location dot will turn into an arrow which can then be used for dead reckoning navigation.
Unfortunately it does not work fully as expected, for example not working in conjunction with the GPS (which has to be off for the arrow to appear), but as a start it is a welcome development indeed.
Read more in this XDA-Developer thread.