The Mercator map distorts the true size of the continents. For example, Africa and Russia have different distances on the map than in reality. A planisphere can show this discrepancy clearly.
seen from United States
seen from Canada
seen from United States

seen from Malaysia
seen from United States

seen from United States

seen from Malaysia

seen from Brazil
seen from China

seen from United States

seen from United States
seen from United States

seen from Malaysia
seen from Malaysia

seen from Russia
seen from United States
seen from United States
seen from Germany
seen from United States
seen from United States
The Mercator map distorts the true size of the continents. For example, Africa and Russia have different distances on the map than in reality. A planisphere can show this discrepancy clearly.