Here's a helpful page that illustrates how you would do it on a handheld like mine.
How to Project a Waypoint <edit>Expired link was removed</edit>
The next step would be to ask the handheld to help you navigate to the projected waypoint.
At the bottom of that page is a link to a Great Circle Calculator
. If you scroll to the second entry you can "Compute lat/lon given radial and distance from a known point". This does the math SpadesFlush was talking about. If you can find something that will help you navigate there with a laptop, you can just plug the coordinates in. Sea Clear II might do the job for the straight-line navigation part??