National IA Frequency Zones (Federal)
scrolling down under the map to find list of changes - 2021 - Michigan split into 2 zones - 2020 - some other changes in Idaho, Utah, and Montana
" The data contains no actual frequencies, but does contain the zones in which they are used. " - ergo - this is a map of frequency zones - not a map of frequencies
scrolling down under the map to find list of changes - 2021 - Michigan split into 2 zones - 2020 - some other changes in Idaho, Utah, and Montana
" The data contains no actual frequencies, but does contain the zones in which they are used. " - ergo - this is a map of frequency zones - not a map of frequencies