Darryl: Yes I can add the registration, however there will be some
users who take their SPOT from glider to glider (clubs, rentals etc).

Frank and Darryl: I'll add one field in which folks can put whatever
"other" locator hardware they have, and a comment field to back up
everything.

So, that's 3 more fields: registration, ELT/PLB/other, and Comment.
Anything else?

And, if there's enough interest (what I meant to say in my OP instead
of "address" -- dang keyboard), I'll beef up the web page so folks can
add and update their data without having me in the loop.

2NO