Thanks, Leadfingers, I looked in the DT area but forgot the search box.
Its a good job I did not sing it as I thought Eric Bogle sang it. I thought the lines :-

But that anchor chain's a fetter
And with it you are tethered to the foam,

was

But that anchor chain's a feather
And with it you are tethered to the phone.

I wondered why it did not seem to make sense.

I have not heard Margaret Christl sing this song, but her rendition of Safe in the Harbour is excellent. Mary Ellen Carter is a song I had not heard sung by Stan Rogers, I have now and yes it deserves to be in his top two in my opinion.
Now I have found Stan Rogers I will certainly not forget him.