Measure the Earth: Useful Links

To find the latitude of your position:

• Find Latitude and Longitude

To convert your latitude to a distance measurement:

• GPS Latitude and Longitude Distance Calculator
  Enter your latitude, but enter 0 (zero) for longitude. Then enter 0 for both latitude and longitude for the equator. Click to calculate your distance to the equator in meters, km, feet, or miles.

[I will also add these to the original post.]