A number of your suggestions push me to work quantitatively. I have been 'eying' my distances - measuring with outstretched hand tip of thumb to tip of little finger = about ten inches.

I would have a better handle on the behavior of my robocar if the SONAR measurements were in decimal inches. Right now I have a system of translating the echo pulse size to inches that I derived empirically. It would make my life easier if when I do a READ of numbers I have stored in EEPROM Data they came out as digital. How with PBP do I do that?