they where used to navigate using sun and stars :)
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Magnectic Compass Astrolabes Quadrants Hand Lead Line ~There are also more that I didn't list down~
Astrolabes were first widely used in the Middle Ages and by about 1450AD they were in use by navigators. They allowed navigators to calculate the position of the Sun and stars from the horizon. Their use was the first step toward scientific navigation. The great age of exploration was coincidental with their use.
An astrolabe was used for finding the time during the day or night, finding the time of a celestial (which is a fancy word for heavenly) event such as a sunrise or sunset, and as a handy reference of celestial positions. Astrolabes were also one of the basic education tools!
well I know that they did not use Viking ship designs. 3======D 0:
salt was used for money