GB/T 13474-1992The method of editing tidal tables and tidal stream charts for ship (English PDF)

3 Technical requirements for the tidal observation data used in the compilation of tide tables

4 Harmonic analysis of tides

5 Difference and ratio numbers and tidal information

6 Technical requirements for the tidal current observation data used in the compilation of tidal current charts and tables

7 Method for harmonic analysis of tidal currents

8 Method for quasi-harmonic analysis of tidal currents

9 Harmonic algorithm for tidal current analysis

10 Calculation of tidal current ellipse elements

11 Calculation of tidal currents

12 Compilation of semidiurnal tidal current charts

Foreword

This document was issued on 4 June 1992 by the State Bureau of Technical Supervision, and has been in force since 1 March 1993.

It is the first edition of this standard.

Classification: ICS 81.040, CCS A45.

About this edition

GB/T 13474-1992 is the first edition of this standard. It was issued on 4 June 1992 and has been in force since 1 March 1993.

There is no earlier edition to compare it with, so a specification that has to refer to this subject can only cite GB/T 13474-1992 itself.

The interval between issue and effect is the transition period. It exists so that producers, laboratories and buyers can requalify products, revise procedures and use up documentation before the new text becomes the one that applies. The date on this page is the official one from the record of the Standardization Administration.

Classification and status

GB/T 13474-1992 is classified under ICS 81.040, in the field of glass and ceramics industries. ICS is the International Classification for Standards, the same scheme used by ISO and by the national bodies of most countries, which is what allows a Chinese standard to be placed beside its foreign counterparts on subject rather than on number.

Its Chinese Standard Classification code is CCS A45. CCS is the domestic scheme, a letter for the sector and two digits for the subject within it, and it is the code by which the standard is filed and searched in China.

The GB/T prefix marks a recommended national standard. It is not, in itself, law: it becomes binding when a contract names it, when a regulation or a mandatory standard refers to it, or when a producer declares conformity with it. In practice that covers most of the cases in which it will be read — a purchase specification, an inspection agreement or a certification scheme.