The long-range option was of considerable interest to the Coast Guard, who set up an experimental system known as LF LORAN in 1945. This operated at much lower frequencies than the original LORAN, at 180 kHz, and required very long balloon-borne antennas. Testing was carried out throughout the year, including several long-distance flights as far as Brazil. The experimental system was then sent to Canada where it was used during Operation Muskox in the Arctic. Accuracy was found to be at , a significant advance over LORAN. With the ending of Muskox, it was decided to keep the system running under what became known as "Operation Musk Calf", run by a group consisting of the United States Air Force, Royal Canadian Air Force, Royal Canadian Navy and the UK Royal Corps of Signals. The system ran until September 1947.
The long-range option was of considerable interest to the Coast Guard who set up an experimental system known as LF LORAN in 1945 This operated at much lower frequencies than the original LORAN at 180 kHz and required very long balloon-borne antennas Testing was carried out throughout the year including several long-distance flights as far as Brazil The experimental system was then sent to Canada where it was used during Operation Muskox in the Arctic Accuracy was found to be at  a significant advance over LORAN With the ending of Muskox it was decided to keep the system running under what became known as "Operation Musk Calf" run by a group consisting of the United States Air Force Royal Canadian Air Force Royal Canadian Navy and the UK Royal Corps of Signals The system ran until September 1947