From Limekiln Software:
TapeMeasure is a GPS based measurement tool which gives you the ability to take measurements from a previous position to your current position. It displays the latitude, longitude, altitude, and accuracy of your current position, as well as shows you the current measurement being taken. Measurement information includes the distance, height, and direction (heading) of the current position from the previous position. This information can be displayed in either feet/miles or meters/kilometers. Once you find a position with enough desired accuracy, you can start a measurement and either watch the live measurement or exit the application and continue the measurement later. This feature is useful for saving power when GPS is enabled. You can pause measurement updates and then either resume measuring from the same start point, or reset your measurement and start again whenever you desire.Please keep in mind that even under the very best conditions with a strong GPS signal on the iPhone or 3G iPad, measurement accuracy will be on the order of several meters/yards, and not inches. YOU WILL NOT BE ABLE TO MEASURE SMALL THINGS like doorways, couches, paintings, etc. This tool is useful for measuring LARGE DISTANCES ONLY. If you have any questions, please visit our website and contact us before purchasing.