How Did Early Explorers Map Rivers?

What Crafty Clover says in this video

Intro

Hi there, curious minds! I'm Crafty Clover! Let's discover something amazing. How did early explorers map rivers?

The Big Idea

Early explorers mapped rivers by sketching as they traveled and using simple tools! They also learned from people who already knew the rivers. Together, they drew maps for others to follow.

Sketch It

Step one: sketching. Explorers sketched maps as they traveled, drawing each bend and island in the river. They used compasses to note which direction they were going. Maps made this way were often beautiful hand drawings.

Count and Measure

Step two: measuring. They counted paddle strokes or hours of travel to estimate distance. They also measured the Sun's height in the sky with special tools to find latitude, which is how far north or south they were.

Local Guides

Step three: guides. Explorers also relied on Indigenous guides, who knew the rivers and portages well from long experience. Surveyor David Thompson mapped thousands of miles of rivers in western Canada. His maps showed rivers, lakes, and trading routes.

A Closer Look

Let's take a closer look at river mapping! Sketch every bend. Use a compass for direction. Count time or strokes for distance. And listen to people who know the land.

Quick Facts

Quick facts! David Thompson's maps were used for many years after he made them. He walked and paddled thousands of miles. Maps help people travel safely. Never look directly at the Sun.

Think Like a Scientist

Now, think like an explorer! Draw a map of a route in your neighborhood by pacing steps and noting turns. Use a compass if you have one. Go with a grown-up! Share what you discover with a grown-up.

Outro

Explorers mapped rivers with sketches, compasses, counting, and local knowledge. Science is amazing! Crafty Clover can be found on Amazon Books, Google Bookstore, and Apple Books. Available for purchase or download! Bye for now!