ISO INTERNATIONAL STANDARD 22090-2 Secondedition 2014-03-01 Ships and marine technology - Transmitting heading devices (THDs) - Part 2: Geomagnetic principles Navires et technologie maritime - Dispositifs de transmission de donnees de pilotage Partie 2: Principes géomagnétiques Reference number ISO 22090-2:2014(E) ISO @ IS0 2014 I without license from IHS Not for Resale IS0 22090-2:2014(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2014 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56:CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ IS0 2014 - All rights reserved No reproductic networking permited without license from IHS Not for Resale IS0 22090-2:2014(E) Contents Page Foreword ..iv 1 Scope .1 2 Normative references ..1 3 Terms and definitions 4 Performance requirements .3 4.1 Functionality .3 4.2 Information 4.3 Fore-and-aft mark 4 4.4 Heading information 4.5 Electrical wiring. 4 4.6 Non-magnetic housing ..4 4.7 Alert signal. 4 4.8 Interface .4 5 Accuracy .5 5.1 General .5 5.2 Accuracy of transmission data 5 5.3 Static error (settle point error) .5 5.4 Dynamic error .5 5.5 Follow-up error. 5.6 Settling time requirements to the directional system. .5 5.7 Correcting the magnetic heading by magnetic variations .5 5.8 Adjusting of magnetic deviations and heeling error. 5 5.9 Means of adjusting the deviation by vertical soft iron of the ship .6 5.10 Protection of correcting devices .6 Type tests. 6 .6 6.1 General .6 6.2 Transmission error test .6 6.3 Fore-and-aft mark test. .7 6.4 Static error test. .7 6.5 Follow-up error test.. .7 6.6 Settling time test. ..7 6.7 Tests for correcting the magnetic heading by magnetic variations. 7 6.8 Tests for adjusting magnetic deviations. 6.9 Tests for the means of adjusting the deviation by vertical soft iron ..8 6.10 Dynamic accuracy. ..8 6.11 Interfacetest ..8 6.12 Malfunction test ..8 7 Marking and identification .8 Annex A (informative) Equivalent requirements in IS0 22090-2 and IM0 Resolution MsC.116(73) 10 Bibliography .11 iii ded by IHS under lic ense with ISt ed without license from IHS Not for Resale