The Hydrologic Radio Frequency
Licensing Guide

The Federal hydrologic frequencies (in MHz) available for use through the ULS are the following:

 
169.4250
169.4375
169.4500
169.4625
169.4750
169.4875
169.5000
169.5125
169.5250
170.2250
170.2375
170.2500
170.2625
170.2750
170.2875
170.3000
170.3125
170.3250
171.0250
171.0375
171.0500
171.0625
171.0750
171.0875
171.1000
171.1125
171.1250
171.8250
171.8375
171.8500
171.8625
171.8750
171.8875
171.9000
171.9125
171.9250
406.125
406.175
412.6625
412.6750
412.6875
412.7125
412.7250
412.7375
412.7625
412.7750
415.1250
415.1750