Answer:
Those enterprises and quests were fantastic and risky enough to discourage investors due to the lack of experience and familiarity with navigational instruments from the potent nations in Europe at that time, limiting their exploration scope to merely coastal; the underdeveloped technology of the time didn't help either, ships without astrolabes or moveable sails were common until the late 15th century when science and technology from the Renaissance period boosted their confidence and ambitions.
Step-by-step explanation: