I had not been able to get WAAS with our 60cx until this latest update. all the new units with the sirfIII chip were having issues with WAAS (this includes the 60cx/60csx & the 76cx/76csx).
If you run the garmin webupdater twice(once for firmware update, second time for the gps software for the sirf III chip) you’ll get the gps software update, it took a minute or two to get lock after the update but works great now.
more info can be found here.
http://forums.groundspeak.com/GC/index.php?showtopic=136356
Garmin webupdater can be found here.
http://www.garmin.com/products/webupdater/howtoinstall.jsp
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