Create an Iphone App that will log GPS X and Y coordinates and Altitude Z coordinates and save them to maps. The X, Y and Z coordinates will then be able to be exported into CSV files readable by Sketchup using a Cloud v8 plug in.
The app will use the PSDs I supply (but may be cleaned up a little)
The app should also have a Units feature that can switch between imperial and metric measurements.
See PDF's for further instruction.