For the last few weeks, I have left my HF radio on the 10m WSPR frequency of 28.1246 MHz and any signals I decode are uploaded automatically to the WSPRnet website.
One of the more unusual signals that I have heard over the last few weeks was DP0POL, the WSPR station on the German polar research vessel Polarstern.
I first noticed this when it was off the west coast of Africa. Between the 22nd of December 2021 and the 3rd of January 2022, I heard the 5-watt signal a total of 39 times. The distances range from 5116 kms to 9705 kms.
I remember checking this a few weeks back and there were no earlier reception before it was off the west coast of Africa. Possibly, it was inside the F2 layer skip zone for me when it was further north.
Back in May of 2021, I was able to track the same ship on 28 MHz as it made its way through the North Sea.