How to spell SEIMSANSHIP correctly?

If you are referring to a misspelled word "seimsanship", it is most likely a typo for "seamanship". Seamanship involves the skills and knowledge needed to safely operate a ship or boat. Other alternative suggestions could include "statesmanship" (the skill of leading a government or being a statesman) or "sportsmanship" (fair and respectful behavior in sports).