No licensed radio stations broadcast on AM frequency 180 kHz any longer.[1] Turkish broadcaster TRT is reported to have used the frequency in the past. In the United States, this frequency falls within the 160-190 kHz LowFER band allowed by Part 15 of the Federal Communications Commission, and hobby stations are permitted to use this frequency.
The audio frequency 180 kHz has been used to track fish.[2][3][4][5]
2 Shortwave uses a combination of AM, VSB, USB and LSB, with some NBFM and CW/morse code (in the case of time signal stations) as well as numerous frequencies, depending on the time of day/night, season, and solar activity level. A reasonably full list from 16 kHz to 27MHz can be found at [1]
3 Regions 1 and 3 also use Region 2's frequencies as well, with 50 to 100 kHz spacing.