<?xml version="1.0" encoding="UTF-8"?><toc><section id="sec_foreword"><title>Foreword</title></section><section id="sec_intro"><title>Introduction</title></section><section id="sec_1"><label>1</label><title>​Scope</title></section><section id="sec_2"><label>2</label><title>​Normative references</title></section><section id="sec_3"><label>3</label><title>​Terms and definitions</title></section><section id="sec_4"><label>4</label><title>​Requirements</title><section id="sec_4.1"><label>4.1</label><title>​General</title></section><section id="sec_4.2"><label>4.2</label><title>​Standard of time and space</title><section id="sec_4.2.1"><label>4.2.1</label><title>​Standard of time</title></section><section id="sec_4.2.2"><label>4.2.2</label><title>​Coordinate system</title></section><section id="sec_4.2.3"><label>4.2.3</label><title>​Vertical reference</title></section><section id="sec_4.2.4"><label>4.2.4</label><title>​Positioning system</title></section></section><section id="sec_4.3"><label>4.3</label><title>​OBS technical indicators</title><section id="sec_4.3.1"><label>4.3.1</label><title>​OBS acquisition system</title></section><section id="sec_4.3.2"><label>4.3.2</label><title>​OBS deployment/recovery system</title></section><section id="sec_4.3.3"><label>4.3.3</label><title>​Power supply system</title></section></section><section id="sec_4.4"><label>4.4</label><title>​Seismic sources</title></section><section id="sec_4.5"><label>4.5</label><title>​Field design</title></section><section id="sec_4.6"><label>4.6</label><title>​Marine exploration process</title><section id="sec_4.6.1"><label>4.6.1</label><title>​OBS preparation</title></section><section id="sec_4.6.2"><label>4.6.2</label><title>​Relevant software, media and files</title></section><section id="sec_4.6.3"><label>4.6.3</label><title>​OBS parameter setting</title></section><section id="sec_4.6.4"><label>4.6.4</label><title>​Glass ball sealing</title></section><section id="sec_4.6.5"><label>4.6.5</label><title>​Pressure tubes</title></section><section id="sec_4.6.6"><label>4.6.6</label><title>​OBS deployment and recovery</title></section><section id="sec_4.6.7"><label>4.6.7</label><title>​Voyage requirements</title></section><section id="sec_4.6.8"><label>4.6.8</label><title>​Timing and positioning</title></section><section id="sec_4.6.9"><label>4.6.9</label><title>​Operation log</title></section></section><section id="sec_4.7"><label>4.7</label><title>​Field data</title><section id="sec_4.7.1"><label>4.7.1</label><title>​Raw data</title></section><section id="sec_4.7.2"><label>4.7.2</label><title>​Relevant data</title></section></section><section id="sec_4.8"><label>4.8</label><title>​Data processing and archiving</title><section id="sec_4.8.1"><label>4.8.1</label><title>​Data processing</title></section><section id="sec_4.8.2"><label>4.8.2</label><title>​Data archiving and reports</title></section></section></section><section id="sec_bibl"><title>Bibliography</title></section></toc>