TABLE OF CONTENTS
1.21.1 Measuring the bearing .................................................................................. 1-33
1.26 Echo Stretch............................................................................................................ 1-43
1.27 Echo Averaging ....................................................................................................... 1-44
1.28 Target Trails............................................................................................................. 1-45
1.28.2 Trail time ....................................................................................................... 1-46
1.28.3 Trail gradation............................................................................................... 1-46
1.28.5 Trail level ...................................................................................................... 1-48
1.28.9 Erasing trails................................................................................................. 1-49
1.29 Parallel Index Lines ................................................................................................. 1-50
1.30 Origin Mark.............................................................................................................. 1-53
1.31 Zoom....................................................................................................................... 1-56
1.32 Markers ................................................................................................................... 1-57
1.32.2 Stern marker ................................................................................................. 1-57
1.32.3 North marker................................................................................................. 1-57
1.32.4 Own ship symbol .......................................................................................... 1-57
1.32.5 Barge marker ................................................................................................ 1-58
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