First very welcome back to the steemit community.
Publishing a Viking post proves that you have recovered well.

From what I read about the Vikings (your ancestors mr @gyldenhorn) after reading your post showed me they were really out of the ordinary people and they had abnormal abilities.

Below an excerpt of what I read about the Vikings.

The Vikings are considered excellent navigators because they have traveled all European seas and beyond and they have traveled the rivers of Western Europe and Russia. This expansion would not have been possible without the quality of the ships they were building.
In addition to their knowledge of the sea The Vikings did not use a compass or compass but Scandinavian sagas recount a "mysterious stone" which allowed the captain to use it as a navigational instrument even in cloudy weather: by pointing it to Zenith, he could find the direction of the sun.

This "sunstone" could actually be an Icelandic spar (Iceland), a transparent crystalline crystal that is relatively common in Scandinavia and has the property of depolarizing sunlight, filtering it differently depending on the score. They did not have cards. At night, they could use the polar star to keep a course and day, rely on the height of the sun to estimate their latitude. It is especially the observation of the sea, landmarks and marine animals that allowed them to find their way on the open sea.

Again perfect recovery and see you in the next episode of the vikings history.
Regards.
@aminekad