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DEPARTMENT OF THE ARMY TECHNICAL BULLETIN		Up
TB-55-6605-262-24 Remote Magnetic Heading Compass (RHMS) Magnetic Compass MK 27 Mod 0 Gyrocompass System MK 27 Mod 1 Gyrocompass System Manual		Next
Figure 1. Binnacle With Compass and Correctors.

TB 55-6605-262-24
LIST OF ILLUSTRATIONS
Figure
Title
Page
1
Binnacle With Compass and Correctors .........................................................
3
2
Mechanics of Magnetic Compass Adjustment .................................................
4
3
Partial Rear View of RMHS Indicator...............................................................
5
4
Typical Heading Indicator Installation . ............................................................
8
5
RMHS Calibration Work Sheet .......................................................................
9
6
RMHS Compass Deviation Card .....................................................................
10
7
Typical Induction Compass Transmitter Installation .........................................
12
8
Mark 27 Mod 1 Gyrocompass Equipment ......................................................
13
9
Summary of Magnetic Compass Errors and Adjustment ................................
15
Section I. INTRODUCTION
1.  Purpose.  This technical bulletin provides information and instructions for the calibration,  GS
maintenance,  and troubleshooting of the magnetic compass,  RMHS,  and MK 27,  Mod 1,  Mod 0
gyrocompass.
2. Scope. This technical bulletin applies to all GS level maintenance activities servicing the magnetic
RMHS, and gyrocompass systems on all Army watercraft.
Section II. CALIBRATION OF COMPASS SYSTEMS
3. Calibration Instructions for Magnetic Compass.
a. Dockside Tests and Adjustments Required Prior to Calibration of Magnetic Compass.
(1) Physical checks on the compass and binnacle (Fig. 1).
(a) Remove any bubbles in compass bowl; refer to manufacturers manual for type and quantity of
fluid required and procedure.
(b) Test for movement and sensibility of compass needles.
(c) Remove any slack in gimbal arrangement.
(d) Check for magnetization of spheres and flinders bars.
(e) Alignment of compasses with fore and aft line or ship.
(f) Alignment of magnets in the binnacle.
(g) Alignment of heeling magnet tube under pivot point of compass.
(h) Ensure that corrector magnets are on hand.
(2) Physical checks of gyro, azimuth circle, and peloruses.
(a) Align all gyro repeater peloruses or dial peloruses with fore and aft line of vessel.
(b) Synchronize gyro repeaters with master gyro compass.
(c) Insure that azimuth circle and peloruses are in good operating condition.
(3) Data required.
(a) Past history of log data that will establish length of flinders bar, if equipped. (Some magnetic
compasses were installed without a flinders bar.)
(b) Azimuths for given date and latitude.
(c) Ranges of distant objects in vicinity (local charts).
(d) Correct variation (local charts).
(4) Precautions.
(a) Determine transient deviations of compass from gyro repeaters, doors, guns, etc..
2

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