AN/APN-4 LORAN Set

The APN-4 was the first LORAN set for aircraft to enter service. It had a separate receiver and display unit. The navigator had a leather hood to put over the oscilloscope’s cathode ray tube so he could clearly see it in daylight. LORAN was most valuable when the skies couldn’t be seen for celestial navigation and when coastlines couldn’t be picked up by radar. It did require a skilled operator.

Caption:
The first LORAN receiver for aircraft use to enter service.
Type: Artifact
Image Date: 2012
Credit: National Air and Space Museum, Smithsonian Institution
Origin: National Air and Space Museum, Smithsonian Institution
Creator: Eric Long
NASM2012-02140
Innovations
Navigation Methods
 
The first LORAN receiver for aircraft use to enter service.
The first LORAN receiver for aircraft use to enter service.
The first LORAN receiver for aircraft use to enter service.
The first LORAN receiver for aircraft use to enter service.