wrote:

What frequencies would have been used for communications? HF? VHF?

http://www.boatnerd.com/

http://cimss.ssec.wisc.edu/wxwise/fitz.html

"At 7 p.m. the Anderson made radio contact with the Fitzgerald and had
her on their radar. When asked how the Fitzgerald was making out they
replied "We are holding our own". This was around 7:10 p.m.. Shortly
afterwards the Fitzgerald disappeared from the Anderson's radar
screen."

Thanks to a link at Trainorders.com for the tip.

It's estimated that between 7:20 and 7:30 pm EST on November 10, 1975 the Edmund
Fitzgerald was lost.

Pause and remember.

dxAce
Michigan
USA