...

Also, beware that currently GPS time is 12 seconds fast from UTC.

The UTC correction is sent in the almanac, I think, as well as the leap second warning. Most boxes make the correction for you, or give you the choice.

And GPS time sources do seem to chime in sync with non-GPS sources: address ref clock st when poll reach delay offset disp *~x.x.x.x .GPS . 1 174 256 377 9.8 -0.21 4.2 +~x.x.x.x .GPS . 1 237 256 377 15.9 0.17 0.4 ~x.x.x.x . . 1 981 1024 377 8.9 157.65 136.0 +~x.x.x.x .ACTS. 1 3 256 377 42.8 -0.31 4.2 -~x.x.x.x .WWVB. 1 334 1024 377 10.0 -7.86 0.2 ~x.x.x.x . . 1 271 1024 373 297.4 66.60 70.4 -~x.x.x.x .WWVB. 1 680 1024 377 18.0 -10.39 2.0 -~x.x.x.x . . 1 219 1024 277 195.8 20.83 40.5 -~y.y.y.y .GPS . 1 21 256 377 24.6 0.73 0.6 +~x.x.x.x .USNO. 1 209 256 377 41.6 0.16 0.2 -~x.x.x.x .USNO. 1 592 1024 377 61.7 17.96 97.0 Or, from another perspective: address ref clock st when poll reach delay offset disp -~x.x.x.x .GPS . 1 686 1024 377 54.9 -10.35 5.2 +~x.x.x.x .USNO. 1 128 128 376 107.0 0.12 0.3 +~x.x.x.x .USNO. 1 113 128 377 107.6 -0.32 2.3 -~x.x.x.x .DCFp. 1 53 512 357 55.6 4.16 10.6 ~x.x.x.x .ACTS. 1 279 1024 377 159.1 -2.54 16.1 -~x.x.x.x .ACTS. 1 347 1024 377 151.7 -2.00 5.9 -~x.x.x.x .GPS . 1 505 1024 377 70.5 6.75 11.2 ~x.x.x.x .GPS . 1 237 1024 377 555.6 7.68 19.5 ~x.x.x.x .WWVB. 1 365 1024 377 162.7 -10.05 18.3 +~y.y.y.y .GPS . 1 183 128 377 164.5 0.83 0.1 +~x.x.x.x .IRIG. 1 14 128 377 114.5 0.44 1.3 ~x.x.x.x .TDF . 1 104 1024 377 116.0 30.94 22.2 +~x.x.x.x .DCFa. 1 124 128 377 35.7 -0.12 0.8 *~x.x.x.x .PL02. 1 78 128 377 2.2 0.42 0.4 ~x.x.x.x .PL01. 2 180 512 377 1.8 0.05 1.7 Note that the y.y.y.y address is the beta test box in question. Addresses changed to protect the guilty. ;-) Tony