Thanks to my blog post about the Ultimate 3 beacon yesterday, Hans Summers has arranged to send me the missing GPS unit from my order earlier in the year. I was going to write, but Hans beat me to it! Hans - thank you.
UPDATE 2022z: I agree that the Ultimate 3 is a pretty comprehensive beacon, but currently it is beyond my (currently clumsy) building skills. I hope next year I'll be able to manage it.