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James Ford Bell Library Home | Gallery Home

Portolan Charts

1424 Nautical Chart

The Grid

Network of lines made within a circle

The rhumbs themselves form a network that is both a grid and a compass.

1424 Nautical Mile Scale

A mile scale is located at the top of the chart.

Use the magnifying glass to see the grid and the scale in the "north" section below.

Under the magnifying glass: