Furuno FMD-3100 Manual page 20

2) The Problem
In the best ENCs you get 5-10-15-20
requirement as per company policy) of ocean going vessels varies considerably and can be anywhere from 4
metres for a small gas carriers to 25 metres for a ULCC. As one can imagine it is a very rare occurrence that the
safe draft of a vessel coincides exactly with the currently available depth contour.
Depending on the safe draft of the vessel and the available depth contours there are the two possible scenarios.
Fig 8 Safe draft equal with one of the available depth contours
Scenario one: The safe draft of the vessel is equal with one of the available depth contours for example, the
safe draft of the vessel is 10.9 metres and the depth contours available in the ENC are 5.4-9.1-10.9-18.26
metres.
Please note that there might be variations of the 5-10-15-20 metres contour pattern when the charts are
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based on fathoms soundings. In those situations we usually have 5.4-9.1-10.9-18.2 metres depth contours
available.
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Z:\Training Courses\TST FMD\TST FMD {out of house}\03.17\04 Trainees Manual\Furuno ECDIS Trainee course manual version 4.0
metres depth contours but the safe draft (safe draft=dynamic draft+UKC
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