Google maps to determine the distance
By means of this Google maps' utility you can get the general distance between two or more points on the satellite map.
The distance is determined in metres and it is recounted in yards automatically.
The length determination of the Loch-Ness in Scotland was shown as example.
You can get the distance or the length not only of big objects such as lakes or rivers but much smaller ones such as the pond near the house or the length of the house if you can find them on Google maps. Use the mouse to determine the new points and move the lines.