I have been listening and copying charts and maps from station "NMF" out of Boston, Ma for a long time. Recently there is NOTHING on their frequencies, no activity. I am in Rhode Island and usually can copy them pretty good on 4.233.10 and 6.338.60 using my IC 7300 and G5RV. I checked ALL their frequencies but nothing to hear. Their website doesnt mention anything about being off the air or anything. Maybe someone on here has idea?