By keeping on a straight line course the ship is en­abled to make a good many more miles on the same num­ber of rev­o­lu­tions or turns of the pro­pel­ler. Under ex­actly the same weath­er con­di­tions a 16,000 ton lin­er made 370 miles in 24 hours at an av­er­age of 86.95 rev­o­lu­tions per min­ute per mile when steered by a mag­ne­tic com­pass, and the same lin­er made 377 miles with 85.61 rev­o­lu­tions per min­ute per mile when steered by the Gy­ro-Com­pass. This sav­ing amounts to eas­ily $50 per day for this ship. Dur­ing her elev­en-day voy­age she saved $550. At this rate of sav­ing the Gy­ro-Com­pass equip­ment is soon paid for.

The Turbinia was the first turbine steamer.

The Sperry Gyro-Compass does not oscillate with the rolling of the ship, or in other words, has no heeling error. The use of the helm is greatly diminished. Records show that on one trans-Atlantic liner a saving of 24 percent in the revolutions of the steering engine, when steered by Gyro-Compass, was effected. One of the largest trans-Atlantic liners reports that but one-third of the helm is used when the ship is steered by Gyro-Compass.

This saving in the use of the steering engine gives actual proof that the ship navigated by a Gyro-Compass steers a straight line course. It further proves that the ship does not divert its slip-stream as often—the power output of the main engines is thereby reduced.

Records taken on a well-known passenger liner show that in making her regular trip between New York and Jacksonville, Florida, she saved more than two hours due to steering by a Sperry Gyro-Compass. A saving of 3,410 turns of her propeller was also effected. These savings were made even with much greater than the usual draft.

Records taken by means of the Sperry Recording Compass show that when the helmsman is given a certain course he can keep the ship one and one-half degrees nearer the course when steering by the Gyro-Compass than when steering by magnetic compass.

The Gyro-Compass can make great savings in money both in construction and operation of the ship. These factors are perhaps trivial when compared with the safety factor introduced by the use of the Sperry Gyro-Compass.

Due to the elim­i­na­tion of the many un­cer­tain­ties of the mag­netic com­pass, insurance com­pan­ies are fav­or­ably dis­posed toward the use of the Sper­ry Gy­ro-Com­pass, which ul­ti­mate­ly will re­sult in a re­duc­tion of in­sur­ance rates.