The United States' NOAA, Canada's Weatheradio, Mexico's SARMEX and Bermuda operate their government weather radio stations on the same marine VHF radio band, using FM transmitters, and the same seven frequencies (162.400 - 162.550 MHz) as NOAA Weather Radio (NWR). Bermuda only uses 162.550 (land) and 162.400 (marine). NWR transmitters operate VHF-FM between 5–1000 watts. NWR channels operating in the range of 162.3625-162.5875 MHz (WX1-WX7) have a band spacing of band spacing of 25 kHz may have bandwidths up to 16 kHz. The original "weather" frequency was 162.550 MHz, with 163.275 MHz initially recommended as a backup and later dropped due to interference problems with other federal agencies.