Freedom From Calculation

A Galleon, the treasure ship of the Spanish Main.Freedom From CalculationEvery time a ship’s course is laid or changed, or its po­si­tion noted, the nav­i­ga­tor must make and apply cal­cu­la­tions to cor­rect the er­rors caused by var­i­a­tion of the earth’s mag­netic fields, and dev­i­a­tion due to local con­di­tions about the ship. Mis­takes are fre­quent­ly made in ap­ply­ing the cor­rec­tion fac­tors by ap­ply­ing them to the wrong side. An er­ror is thus in­tro­duced, which in mag­ni­tude is twice the cor­rec­tion factor. Ins­tances are re­port­ed of ships being 200 miles out of their courses as a result.The Gyro-Compass re­quires no cor­rec­tions since it is un­dis­turbed by var­i­a­tions or any local mag­ne­tic con­di­tions. The read­ing in­di­ca­ted by the Sper­ry Gyro-Com­pass is not ap­prox­i­mate—it is ab­so­lute­ly and im­me­diate­ly cor­rect. It is not ne­ces­sary to cor­rect the course every few hours for var­ia­tion—the nav­i­ga­tor is freed from the ne­ces­si­ty of ma­king cal­cu­la­tions.Freedom From CompensationAfter the nav­i­ga­tor has made cal­cu­la­tions for the dev­i­a­tion er­rors of the Mag­ne­tic Com­pass, they must be ap­plied by means of man­i­pu­la­ting the soft iron globes and com­pen­sa­ting mag­nets. This is an op­er­a­tion re­quir­ing such a high de­gree of skill that only trained men called Com­pass Ad­just­ers are qual­i­fied for the work.The oc­cas­ion­al turn­ing of a thumb nut is the only com­pen­sa­tion nec­es­sary in the use of a Sper­ry Gy­ro-Com­pass. No tables or curves are re­quired. The ship’s Nav­i­gat­ing Of­ficer makes this ad­just­ment with ease.

A Galleon, the treasure ship of the Spanish Main.

A Galleon, the treasure ship of the Spanish Main.

Freedom From CalculationEvery time a ship’s course is laid or changed, or its po­si­tion noted, the nav­i­ga­tor must make and apply cal­cu­la­tions to cor­rect the er­rors caused by var­i­a­tion of the earth’s mag­netic fields, and dev­i­a­tion due to local con­di­tions about the ship. Mis­takes are fre­quent­ly made in ap­ply­ing the cor­rec­tion fac­tors by ap­ply­ing them to the wrong side. An er­ror is thus in­tro­duced, which in mag­ni­tude is twice the cor­rec­tion factor. Ins­tances are re­port­ed of ships being 200 miles out of their courses as a result.The Gyro-Compass re­quires no cor­rec­tions since it is un­dis­turbed by var­i­a­tions or any local mag­ne­tic con­di­tions. The read­ing in­di­ca­ted by the Sper­ry Gyro-Com­pass is not ap­prox­i­mate—it is ab­so­lute­ly and im­me­diate­ly cor­rect. It is not ne­ces­sary to cor­rect the course every few hours for var­ia­tion—the nav­i­ga­tor is freed from the ne­ces­si­ty of ma­king cal­cu­la­tions.

Every time a ship’s course is laid or changed, or its po­si­tion noted, the nav­i­ga­tor must make and apply cal­cu­la­tions to cor­rect the er­rors caused by var­i­a­tion of the earth’s mag­netic fields, and dev­i­a­tion due to local con­di­tions about the ship. Mis­takes are fre­quent­ly made in ap­ply­ing the cor­rec­tion fac­tors by ap­ply­ing them to the wrong side. An er­ror is thus in­tro­duced, which in mag­ni­tude is twice the cor­rec­tion factor. Ins­tances are re­port­ed of ships being 200 miles out of their courses as a result.The Gyro-Compass re­quires no cor­rec­tions since it is un­dis­turbed by var­i­a­tions or any local mag­ne­tic con­di­tions. The read­ing in­di­ca­ted by the Sper­ry Gyro-Com­pass is not ap­prox­i­mate—it is ab­so­lute­ly and im­me­diate­ly cor­rect. It is not ne­ces­sary to cor­rect the course every few hours for var­ia­tion—the nav­i­ga­tor is freed from the ne­ces­si­ty of ma­king cal­cu­la­tions.

Every time a ship’s course is laid or changed, or its po­si­tion noted, the nav­i­ga­tor must make and apply cal­cu­la­tions to cor­rect the er­rors caused by var­i­a­tion of the earth’s mag­netic fields, and dev­i­a­tion due to local con­di­tions about the ship. Mis­takes are fre­quent­ly made in ap­ply­ing the cor­rec­tion fac­tors by ap­ply­ing them to the wrong side. An er­ror is thus in­tro­duced, which in mag­ni­tude is twice the cor­rec­tion factor. Ins­tances are re­port­ed of ships being 200 miles out of their courses as a result.The Gyro-Compass re­quires no cor­rec­tions since it is un­dis­turbed by var­i­a­tions or any local mag­ne­tic con­di­tions. The read­ing in­di­ca­ted by the Sper­ry Gyro-Com­pass is not ap­prox­i­mate—it is ab­so­lute­ly and im­me­diate­ly cor­rect. It is not ne­ces­sary to cor­rect the course every few hours for var­ia­tion—the nav­i­ga­tor is freed from the ne­ces­si­ty of ma­king cal­cu­la­tions.

Every time a ship’s course is laid or changed, or its po­si­tion noted, the nav­i­ga­tor must make and apply cal­cu­la­tions to cor­rect the er­rors caused by var­i­a­tion of the earth’s mag­netic fields, and dev­i­a­tion due to local con­di­tions about the ship. Mis­takes are fre­quent­ly made in ap­ply­ing the cor­rec­tion fac­tors by ap­ply­ing them to the wrong side. An er­ror is thus in­tro­duced, which in mag­ni­tude is twice the cor­rec­tion factor. Ins­tances are re­port­ed of ships being 200 miles out of their courses as a result.

Every time a ship’s course is laid or changed, or its po­si­tion noted, the nav­i­ga­tor must make and apply cal­cu­la­tions to cor­rect the er­rors caused by var­i­a­tion of the earth’s mag­netic fields, and dev­i­a­tion due to local con­di­tions about the ship. Mis­takes are fre­quent­ly made in ap­ply­ing the cor­rec­tion fac­tors by ap­ply­ing them to the wrong side. An er­ror is thus in­tro­duced, which in mag­ni­tude is twice the cor­rec­tion factor. Ins­tances are re­port­ed of ships being 200 miles out of their courses as a result.

The Gyro-Compass re­quires no cor­rec­tions since it is un­dis­turbed by var­i­a­tions or any local mag­ne­tic con­di­tions. The read­ing in­di­ca­ted by the Sper­ry Gyro-Com­pass is not ap­prox­i­mate—it is ab­so­lute­ly and im­me­diate­ly cor­rect. It is not ne­ces­sary to cor­rect the course every few hours for var­ia­tion—the nav­i­ga­tor is freed from the ne­ces­si­ty of ma­king cal­cu­la­tions.

The Gyro-Compass re­quires no cor­rec­tions since it is un­dis­turbed by var­i­a­tions or any local mag­ne­tic con­di­tions. The read­ing in­di­ca­ted by the Sper­ry Gyro-Com­pass is not ap­prox­i­mate—it is ab­so­lute­ly and im­me­diate­ly cor­rect. It is not ne­ces­sary to cor­rect the course every few hours for var­ia­tion—the nav­i­ga­tor is freed from the ne­ces­si­ty of ma­king cal­cu­la­tions.

Freedom From CompensationAfter the nav­i­ga­tor has made cal­cu­la­tions for the dev­i­a­tion er­rors of the Mag­ne­tic Com­pass, they must be ap­plied by means of man­i­pu­la­ting the soft iron globes and com­pen­sa­ting mag­nets. This is an op­er­a­tion re­quir­ing such a high de­gree of skill that only trained men called Com­pass Ad­just­ers are qual­i­fied for the work.The oc­cas­ion­al turn­ing of a thumb nut is the only com­pen­sa­tion nec­es­sary in the use of a Sper­ry Gy­ro-Com­pass. No tables or curves are re­quired. The ship’s Nav­i­gat­ing Of­ficer makes this ad­just­ment with ease.

After the nav­i­ga­tor has made cal­cu­la­tions for the dev­i­a­tion er­rors of the Mag­ne­tic Com­pass, they must be ap­plied by means of man­i­pu­la­ting the soft iron globes and com­pen­sa­ting mag­nets. This is an op­er­a­tion re­quir­ing such a high de­gree of skill that only trained men called Com­pass Ad­just­ers are qual­i­fied for the work.The oc­cas­ion­al turn­ing of a thumb nut is the only com­pen­sa­tion nec­es­sary in the use of a Sper­ry Gy­ro-Com­pass. No tables or curves are re­quired. The ship’s Nav­i­gat­ing Of­ficer makes this ad­just­ment with ease.

After the nav­i­ga­tor has made cal­cu­la­tions for the dev­i­a­tion er­rors of the Mag­ne­tic Com­pass, they must be ap­plied by means of man­i­pu­la­ting the soft iron globes and com­pen­sa­ting mag­nets. This is an op­er­a­tion re­quir­ing such a high de­gree of skill that only trained men called Com­pass Ad­just­ers are qual­i­fied for the work.The oc­cas­ion­al turn­ing of a thumb nut is the only com­pen­sa­tion nec­es­sary in the use of a Sper­ry Gy­ro-Com­pass. No tables or curves are re­quired. The ship’s Nav­i­gat­ing Of­ficer makes this ad­just­ment with ease.

After the nav­i­ga­tor has made cal­cu­la­tions for the dev­i­a­tion er­rors of the Mag­ne­tic Com­pass, they must be ap­plied by means of man­i­pu­la­ting the soft iron globes and com­pen­sa­ting mag­nets. This is an op­er­a­tion re­quir­ing such a high de­gree of skill that only trained men called Com­pass Ad­just­ers are qual­i­fied for the work.

After the nav­i­ga­tor has made cal­cu­la­tions for the dev­i­a­tion er­rors of the Mag­ne­tic Com­pass, they must be ap­plied by means of man­i­pu­la­ting the soft iron globes and com­pen­sa­ting mag­nets. This is an op­er­a­tion re­quir­ing such a high de­gree of skill that only trained men called Com­pass Ad­just­ers are qual­i­fied for the work.

The oc­cas­ion­al turn­ing of a thumb nut is the only com­pen­sa­tion nec­es­sary in the use of a Sper­ry Gy­ro-Com­pass. No tables or curves are re­quired. The ship’s Nav­i­gat­ing Of­ficer makes this ad­just­ment with ease.

The oc­cas­ion­al turn­ing of a thumb nut is the only com­pen­sa­tion nec­es­sary in the use of a Sper­ry Gy­ro-Com­pass. No tables or curves are re­quired. The ship’s Nav­i­gat­ing Of­ficer makes this ad­just­ment with ease.

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