Well, jumpstarted by the topic by 'Endofdays', I decided to go out and take a look at a real, live, NDB/OM station ('compass locator' or whatever). And its only a few miles away.
The DONDO NDB (in the 1800 block of S 265 PL, with access from Pac Hwy on 268 ST by the new Woodmont library) also serves as the OM for SeaTac. Interesting tech stuff there. Its the 'wire between poles' type and I suggest that anyone living in the Seattle area that is interested in that kind of stuff checks it out. Really surprised me, even after seeing pictures on the internet of things just like it. It is located in a small residential area with a 'no outlet' sign on it. It is the OM for runways 34. You can see the OM for rwys 16 at Boeing Field, but I am not exactly sure where at BFI.
My next venture: a VOR station...hehe