Cross Staff & Back Staff Geocoin Cross Staff & Back Staff Geocoin

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Owner:
MIG2 Send Message to Owner Message this owner
Released:
Saturday, December 27, 2008
Origin:
Oregon, United States
Recently Spotted:
In 9. Neujahrs - Stammtisch Oberlausitzer Bergland

This is not collectible.

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Current Goal

To go everywhere in the world where folks are curious about navigation.

About This Item

The back-staff, also known as the Davis quadrant (called a quadrant because it could measure up to 90º), was the first instrument specifically designed for finding latitude at sea. English explorer John Davis conceived the instrument while on a voyage to find the Northwest Passage and in 1595 described it in his book The Seamen’s Secrets. Like the instruments before it, the back-staff was developed in an effort to correct some of the deficiencies associated with the use of the cross-staff; that is, having to look at two places at once (which with larger angles could produce highly inaccurate measurements) and having to look directly into the sun when using the instrument during the day. To overcome these problems some navigators began using the cross-staff backwards with the sun coming over the shoulder. By fitting the cross-staff with a small horizon vane, the navigator could sight the horizon and measure the height of the sun at the same time. It was this new method that led to the development of the back-staff.

Gallery Images related to Cross Staff & Back Staff Geocoin

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Tracking History (25005.4mi) View Map

Dropped Off 1/20/2018 Schnattchen70 placed it in 9. Neujahrs - Stammtisch Oberlausitzer Bergland Sachsen, Germany - 9.1 miles  Visit Log
Visited 1/1/2018 Schnattchen70 took it to Vertreibe den Kater Vol. III Sachsen, Germany - 11.74 miles  Visit Log
Visited 12/26/2017 Schnattchen70 took it to Let's Quest#2 - Der Weihnachtsvorfall Sachsen, Germany - 8.17 miles  Visit Log
Visited 11/12/2017 Schnattchen70 took it to Nedaschützer Skala Sachsen, Germany - 263.92 miles  Visit Log
Visited 10/31/2017 Schnattchen70 took it to 4. Dresden Glockenpavillon Event Sachsen, Germany - 227.75 miles  Visit Log
Visited 10/31/2017 Schnattchen70 took it to Multi am Stausee Sachsen, Germany - 255.66 miles  Visit Log
Visited 10/9/2017 Schnattchen70 took it to L!QU!DAT☢R Hessen, Germany - 22.21 miles  Visit Log
Visited 10/6/2017 Schnattchen70 took it to Die Kinder des Buchbinders Hessen, Germany - 36.2 miles  Visit Log
Visited 10/3/2017 Schnattchen70 took it to NIGHTMARE ON Hessen, Germany - 267.45 miles  Visit Log
Visited 10/1/2017 Schnattchen70 took it to Ein ..... wird kommen! Sachsen, Germany - 23.2 miles  Visit Log
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