We are in the process of collecting Navy, Submarine and Navigation artifacts for the period 1944 to 1975.
If you have artifacts from this period please email a picture and description to our webmaster at email@example.com.
<= To the left is a 1954 Navy Electronics Technician 3, NAVPRES 10188, NAVY TRAINING COURSES manual “Prepared by BUREAU OF NAVY PERSONNEL” that was used to train shipboard Electronics Technicians how to maintain the electronics aboard CLAMAGORE. There are chapters on: 7. Vacuum-Tube Principles, 8. Gas-Filled Tubes, 10. Amplifier Circuits, 12. Transmitters and 15. Propagation of Radio Waves.
Radio Wave Propagation was very important as subs needed to transmit and receive encrypted teletype messages using their sloping long-wire antennas during the times that they were surfaced. Long range communications typically used the MF or HF frequencies between about 1.5 and 30 MHz. “The Navy regularly publishes tables that predict the most efficient operating frequencies for use at a given hour, date, and season. These tables are published in nonregistered publication memoranda (NPRM) which are issued by the Chief of Naval Operations every 3 months. The NPRM tables give recommended frequency bands, which ships and aircraft in the Atlantic and Pacific Oceans can use for communicating to and from certain bases, such as Perl Harbor….”
<= Before modern GPS with WAAS corrections to +/- 10 foot accuracy that we take for granted today subs had to refer to manuals like this to find Loran A and C stations that in some locations had accuracies of only +/- two nautical miles, OMEGA stations, CONSOL stations in Europe or DECA. Many of these systems involved pages of manual corrections that had to be applied to the raw data.
These electronic techniques supplemented and acted as a check on traditional celestial navigation techniques using a sextant and accurate clocks. Sextant sites needed to be made at sunrise, local noon or sunset. These sextant sites required the sub to be on the surface and the sky had to be clear. Even after obtaining a run of at least three sites on two and preferably three known stars, laborious calculations using HO229 (SIGHT REDUCTION TABLES FOR MARINE NAGIGATION) and a current copy of the Nautical Almanac were required.
<= This is a 1969 copy of the 715+ page copy of “Dutton’s” that is a standard Navy text for teaching navigation including celestial sight tanking and reduction. The “AMERICAN PRACTICAL NAVIGATOR”, usually just referred to as Bowditch, for its author, is even longer at over 1,300 pages and that doesn’t even include the separate 700+ page book of tables. Marine navigation used to be a lot of fun. Now everyone just looks at their ECDIS, GPS based, Electronic Chart Display and Information System and radar unless you are on a submerged “Boomer”.
<= This 1957 Navy training manual is just one more of the items we have located for our museum. Especially in the area of electronics we have come a long way since this book was released. Items like this will help young people relate to the past and how we got where we are today.