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Navigation: an astrolabe, a cross-staff, and a back-staff or Davis's sextant. Drawing after Edmund Gunter, 1624.

A woman holds up an astrolabe and points down to a globe; representing astronomy. Engraving by E. Delaune, ca. 1560.

Navigation: a man using a Jacob's staff (cross staff), various other measuring devices at his feet. Woodcut, 16--.

Navigation: a cross-staff or cross-bow, and a sailor using the device. Drawing after Edmund Gunter, 1624.

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Navigation: an astrolabe, a cross-staff, and a back-staff or Davis's sextant. Drawing after Edmund Gunter, 1624.

A woman holds up an astrolabe and points down to a globe; representing astronomy. Engraving by E. Delaune, ca. 1560.

Navigation: a man using a Jacob's staff (cross staff), various other measuring devices at his feet. Woodcut, 16--.

Navigation: a cross-staff or cross-bow, and a sailor using the device. Drawing after Edmund Gunter, 1624.