I'm familiar with that, but it seems cumbersome, at least for "field" stuff. (as if taking a monorail into the field isn't cumbersome enough)

My reasoning for wanting to have a table with subject distances is the ability to take some measurement-standard on your body. For instance, the "hang ten" sign with your hand; that distance won't change, and if you know what it is you could quite accurately measure distances in the field w/o a ruler or anything. The distance from your elbow to fingertips could be another measurement, and so on.

Come to think of it, I'm just gonna get a huge ruler tattooed down the length of my arm and a yardstick down my leg....