Running down I-75 in southern Tennessee last night, using a HP1 with GPS to scan. Close to the Georgia border, the scanner locked up on 162.550 - which is one of the standard NOAA weather radio frequencies. Because of their continuous broadcasting, these don't normally get put in a scan list, as the scanner will just lock up on that channel. I finally had to avoid the channel to get back to normal scanning. Later on when we were off the road for the night, I checked why it was showing up in the list and found that in the RR database listing for the Tennessee Fire Service and Codes Enforcement Academy (TFACA) 162.400, 162.475 and 162.550 are listed as "Channels 15, 16 and 14" . I'm scratching my head on this - does TFCA actually transmit on the NOAA channels, but more importantly, why put frequencies in the DB that because of their continuous transmission nature will lock a scanner up?