Furuno FMD-3100 Manual page 22

i. Workaround #1
Two colour pattern is used.
Safety contour and safety depth are set equal to safe draft and No-Go Areas are drawn manually by the
navigator.
Advantages
• Procedure for deciding the safety contour and safety draft are clear, simple and always remains the
same, irrespective of the situation.
• Isolated dangers which are applicable for the vessel will be shown (please note that isolated dangers
will be shown only if the function "show isolated danger in shallow area" is activated).
Disadvantages
• Vessel will sail through blue waters, which is considered 'unsafe' in scenario one.
• Safety contour alarm will not sound at the proper depth but will sound at a much earlier stage.
• Area portrayed as 'unsafe' (area inside the safety contour) will not correspond to reality.
• Image not clear in dusk and night time setting.
• Misinterpretation and feeling of complacency by navigating with an activated anti-grounding alarm.
Fig 10: Safety contour=13m, Safety depth=13m, two color depth selected No-Go Areas are drawn
Z:\Training Courses\TST FMD\TST FMD {out of house}\03.17\04 Trainees Manual\Furuno ECDIS Trainee course manual version 4.0
manually by the navigator
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