Before revision: Peiscopes are useful Deep water navigationAt depths below periscope depth submarines determine their position using:Dead reckoning course information obtained from the ship's gyrocompass, measured speed and estimates of local ocean currents, this could also be considered an estimated position as long as the ocean current is computed in.Inertial navigation system is an estimated position source, utilizing acceleration, deceleration, and pitch and roll for computing.Bottom contour navigation may be used in areas where detailed hydrographic data has been charted and there is adequate variation in sea floor topography.
After revision: Deep water navigationAt depths below periscope depth submarines determine their position using:Dead reckoning course information obtained from the ship's gyrocompass, measured speed and estimates of local ocean currents, this could also be considered an estimated position as long as the ocean current is computed in.Inertial navigation system is an estimated position source, utilizing acceleration, deceleration, and pitch and roll for computing.Bottom contour navigation may be used in areas where detailed hydrographic data has been charted and there is adequate variation in sea floor topography.