Natl IA Freqs Map - wildfire

zerg901

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Apr 19, 2005
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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
 

es93546

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East of the Sierra Crest-Right Side of CA on Map
Most of this hasn't changed. When changes have been made, such as Michigan, clicking onto the zone allows you to see notes as to what was changed and the date those changes became effective. There has been an effort to make sure these zones match dispatch center boundaries as some did not line up when these zones were first established.

Now the challenge is going to be finding the 2021 maps showing frequency use in each zone.
 

cajunjerry

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Mar 13, 2004
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697
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Springhill,La.
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
I worked for the US forest service out of Tawas Michigan back in the 80s....back then they were on 169.925. Those were the easy ones to get
 
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