...result from twice the number 'Pi' which is about 3.14...therefore 6.28 (or 628) radians make one circle round. Sadly I can´t find the site anymore where I had found these different type of writings.

However I think we now can be sure what Z meant with Radians (direction) and Inches along the radians (distance). Should be a typical (military) navigational term, this indeed strengthens any assumptions that Z worked had military education (walker boots, cryptography, navigation). Maybe he also was a teacher by profession.

While I had posted one solution, others might be worth to be mentioned as well (although the sign on 26, St. Stephens Drive is somehow strange - however I couldn´t find such a similar sign online). If anybody offers another solution of the cipher, I am willing to calculate the detailed longitude/latitude position of it. It would be interesting how these navigational issues had been dealt at institutions like March Air Reserve Base (Riverside).

If anybody has a connection to former airforce base employees, please keep the following questions in mind

- accessability of name lists (comparison with my-name-is-cipher)

- type of writing down navigational coordinates (e.g. RADONEPOINTEIGHTEEN etc..)

Last one for sure would help to find a perfect match, if not already been found (anybody wants to dig @ 26, St. Stephens Drive?)

BTW, this kind of navigation is called terrestric or 'waypoint' navigation and such issues have been used aviation as well, e.g. in the book 'Air navigation' from Frederick George Brown.

Quicktrader