Photograph as originally submitted to this page in the Historical Marker Database www.HMdb.org. Click on photo to resize in browser. Scroll down to see metadata.
Marker inset: <i>Using a method called "triangulation"...</i>
Photographer: Vivian Young
Caption: Marker inset: Using a method called "triangulation"...
Additional Description: Using a method called "triangulation” and data provided by two lookout posts (base end stations) positioned in key spots along the coast, a plotting crew could pinpoint targets miles out to sea.
Submitted: January 15, 2022, by Andrew Ruppenstein of Lamorinda, California.
Database Locator Identification Number: p633964
File Size: 0.321 Megabytes

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