Fürstenberg
Fürstenberg
ECDIS Basics
ECDIS Basics
ENC-Scales (Usage Bands)
ENCs are created and designed for different scale ranges (Usage Bands). The definition of which scale has to be used for which Usage Band is not yet internationally agreed; however the IHO is currently circulating a paper with recommendations. The table provides an overview about the common scale ranges for each Usage Band:
| Number | Usage Band | Scale Range |
| 6 | Berthing | 1:2 000 to 1:5 000 |
| 5 | Harbour | 1:2 000 to 1:25 000 |
| 4 | Approach | 1:20 000 to 1:50 000 |
| 3 | Coastal | 1:50 000 to 1: 150 000 |
| 2 | General | 1:150 000 to 1:400 000 |
| 1 | Overview | smaller than 1:300 000 |
ENC Overlapping
Although ENCs with the same Usage Band may overlap; the displayed information must not. ENCs with a different Usage Band could overlap both area and displayed information. The image shows the possibility of overlapping of ENCS with different Usage Band.
Overlapping of ENC
ENC scales and Radar ranges
ECDIS is able to overlay the chart display with radar image. To harmonize both displays reasonable accurate Hydrographic Offices are encouraged to adjust their ENC scales with the usually used Radar ranges. The table below gives an overview and compares both:
| Radar Range | ENC Scale |
|---|---|
| 200 nm | 1:3 000 000 |
| 96 nm | 1:1 500 000 |
| 48 nm | 1:700 000 |
| 24 nm | 1:350 000 |
| 12 nm | 1:180 000 |
| 6 nm | 1:90 000 |
| 3 nm | 1:45 000 |
| 1,5 nm | 1:22 000 |
| 0,75 nm | 1:12 000 |
| 0,5 nm | 1:8 000 |
| 0,25 nm | 1:4 000 |
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