[Answer] How did pilots in the 1920s navigate?

Step 1 : Introduction to the question "How did pilots in the 1920s navigate?"

...1. X-Ray vision 2. Word of mouth 3. Concrete arrows on the ground 4. Printed almanacs

Step 2 : Answer to the question "How did pilots in the 1920s navigate?"

Concrete arrows on the ground - Before fancy navigation instruments, radar, and GPS, pilots had to rely on their eyes. But it can be pretty hard to navigate a particular route at night. Between 1924 and 1931, a network of concrete arrows and lighted beacons were installed to guide airmail pilots through the skies. About 1,550 of the arrows were placed along routes stretching throughout an 18,000-mile network. One route, nicknamed the Highway of Light, ran along what is now mostly Interstate 80, from San Francisco to New York. Approximately 200 of the arrows remain, with most of the intact sets found in the San Francisco Bay area. :

Please let us know as comment, if the answer is not correct!

Step 3 : Disclaimer & Terms of Use regarding the question "How did pilots in the 1920s navigate?"

Our machine learning tool trying its best to find the relevant answer to your question. Now its your turn, "The more we share The more we have". Share our work with whom you care, along with your comment ...Kindly check our comments section, Sometimes our tool may wrong but not our users.

Are We Wrong To Think We're Right? Then Give Right Answer Below As Comment