East Toledo in Lucas County, Ohio — The American Midwest (Great Lakes)

Radio Direction Finder

Photographed by Craig Doda, June 17, 2022

1. Radio Direction Finder Marker

Inscription. For millennia, ships out of sight of land navigated by using the position of the sun, moon, and stars. The discovery of radio waves changed navigation forever. By the late 1920s, ships used special antennas called radio direction finders (RDF) to determine the source of radio navigation transmissions on land. By measuring the strength and thus the distance from various transmitters, a navigator could triangulate the ship's relative location. RDF remained the primary means of navigation until the Global Positioning System gained wide use; the last RDF transmissions in the US and Canada ended in 2010.

Erected by Helen H. and Gregor K. Emmert, Sr.

Topics. This historical marker is listed in this topic list: Waterways & Vessels. A significant historical year for this entry is 2010.

Location. 41° 39.372′ N, 83° 30.97′ W. Marker is in Toledo, Ohio, in Lucas County. It is in East Toledo. It is on South Marina Drive, on the left when traveling north. Touch for map. Marker is at or near this postal address: 1525 S Marina Drive, Toledo OH 43605, United States of America. Touch for directions.

Regionally, this marker is on Ohio’s

Paid Advertisement

Click or scan to see
this page online

Lake Erie Shore.

It is also in the American Midwest,

on the Great Lakes,

and in the Corn Belt.

Globally, it is in North America,

the Western Hemisphere,

the Western World,

and the Anglosphere.

Historically, it finds itself in what was once the Viceroyalty of New France,

the Haudenosaunee (Iroquois) Confederacy,

the territory of the Mississippian Culture,

and the Northwest Territory.

Other nearby markers. At least 8 other markers are within walking distance of this marker: This Memorial Is Dedicated To All Who Served Aboard Submarines (a few steps from this marker); America's Submarines Of The Great Lakes (a few steps from this marker); Stack Emblems (within shouting distance of this marker); Great Lakes: A Powerful Force (within shouting distance of this marker); A Shaping Force (within shouting distance of this marker); A Life Force (within shouting distance of this marker); Capstan (within shouting distance of this marker); A Deadly Force (within shouting distance of this marker). Touch for a list and map of all markers in Toledo.

Photographed by Craig Doda, June 17, 2022

2. Radio Direction Finder Marker

Photographed by Craig Doda, June 17, 2022

3. Radio Direction Finder Marker

Credits. This page was last revised on February 4, 2023. It was originally submitted on August 23, 2022, by Craig Doda of Napoleon, Ohio. This page has been viewed 411 times since then and 60 times this year. Photos: 1, 2, 3. submitted on August 23, 2022, by Craig Doda of Napoleon, Ohio. • Bill Pfingsten was the editor who published this page.