I am making a signpost thingie for my yard that will have directional arrows pointing toward places I like, along with the distance in miles/kilometers. For example, there will be a Hilton Head, SC arrow and a Sint Maarten arrow. I will use a compass to approximate the direction each sign points, but how do I determine distance?

I have entered the locations into GoogleEarth, so I have the longitude/latitude for each point, as well as the lat/long for my house. How do I go from that to distance?

Thanks.