[time-nuts] Accuracy of 10mhz - a simple explanation?

[N3IZN at aol.com]

Accuracy of 10mhz - a simple explanation?
 
So can any one provide a link or want to try and explain to this layman  what 
the deal is with the accuracy spec provided by (or should I say claimed by)  
the various manufactures and kits out there?
 
For example my Trimble claims to have accuracy of 1.16 X 10 -12.
 
I'm guessing that the exponent at the end of the spec, the higher the  better?
 
Just how high can you get? How high is needed to say lock a amateur  
transverter to for 10 or 24 ghz?
 
How does my Trimble compare to some of the GPS disciplined oscillators out  
there?
 
Thanks