Result

A diagram that displays the calculated under keel clearance along the planned itinerary. Three types of under keel clearance are calculated:

• UKC is the static keel clearance: the water depth minus the ship's draft, including the current water level.
• UKC (minus squat) subtracts the ship's squat from the static keel clearance.
• UKC (minus all corrections) is the dynamic keel clearance: it further reduces the clearance by accounting for vertical motion and heeling.

The diagram also displays the configured safety criteria for under keel clearance. Safety criteria can be defined for each type of under keel clearance and can based on either absolute or relative under keel clearance. Absolute criteria are evaluated against the lower bound of the confidence intervals (worst-case percentile value). Relative criteria are evaluated against the mean of the confidence intervals. These criteria are applied when determining local tidal windows.

A diagram that displays the calculated roll and pitch along the planned itinerary. The values represent the significant double amplitude for the roll and pitch.

A diagram that displays the calculated bottom touch probability along the planned itinerary. The bottom touch probability represents the chance that selected points on the ship will move downward more than the available keel clearance.

The diagram also displays the configured safety criteria for bottom touch probability. It is configurable whether the criteria are evaluated against the mean or the worst-case percentile value. These criteria are applied when determining local tidal windows.

A polar diagram that displays the vertical motion per speed and heading. The diagram shows the vertical motion for the passage time of a predefined location.

A diagram that displays the speeds that were used in the calculation. It includes lines for the mean speed over ground and the mean speed through water along the planned itinerary.

The diagram also visualizes the speed regime for the calculation as a semi-transparent bandwidth.

A diagram that displays the calculated squat along the planned itinerary. The squat is computed based on the speed through water. Different squat calculation methods are supported.

A diagram that presents tide-related information for the calculation period at a predefined location on the route. It presents both the data used in the calculation and the most recent available data.

The diagram shows the water level and (if available) the cross current. If current restrictions are applied in the calculation, the current is included as well.

The diagram also displays the configured (cross) current restrictions at the selected location. These restrictions are applied when determining local tidal windows.

The cross current is the component of the current perpendicular to the channel direction. Its sign indicates the orientation relative to the segment: a positive value represents a flow 90° clockwise from the segment direction, while a negative value represents a flow in the opposite direction.

A diagram that displays the wave height (H_m0) and swell (H_E10) for the calculation period at a predefined location on the route. It presents both the data used in the calculation and the most recent available data. The swell height is based on waves with a period over ten seconds.

The diagram also displays the configured swell restrictions at the selected location. These restrictions are validated when judging a calculation as definitive.

A polar diagram that displays the wave energy density per frequency and direction. The diagram shows the wave spectrum data for the passage time at a predefined location on the route.

A diagram that displays the segment depths and active channel bottom elevations.

Judge the calculation as indicative, definitive or declined. By default, a calculation has a tentative judgment.

A warning will be given if the calculation is assigned to a calculation request.

When judging the calculation as definitive, additional validation checks are performed. An overview of these checks can be found in the description of the Validation table.

Provide an acknowledgment for the calculation.

An overview of all acknowledgments can be found in the Acknowledgments table.

Assign the calculation to a calculation request.

The action is only available when the calculation is judged as indicative or definitive, and the corresponding transit has a calculation request.

Send an e-mail with the calculation PDF report (summary or extended) attached. The content of the e-mail can be customized per port based on a template. If no template is configured for a port, a default e-mail template will be used for this action.

Default recipients of the e-mail can be configured per port. Recipients can be added or removed from the predefined list.

Download the calculation PDF report (full report or summary). The content of the report can be customized per port based on a template. If no template is configured for a port, a default report template will be used for this action.

Update the itinerary of the calculation to pass a selected location at a given time. A warning will be given if the new itinerary is not safe.

Optimize the itinerary of the calculation based on a selected calculation statistic. The most critical location along the route is used to determine the optimal itinerary.

When a flexible speed interval is configured, the Tidal window diagram displays two types of safe segments. Normal safe segments (blue) are calculated for the configured speed regime, which defines a target speed (and spread) for each part of the route. Safe segments for flexible speed (purple) are calculated for the entire range of speeds in the configured flexible speed interval.

In other words, blue segments indicate if the vessel can safely navigate at the target speeds from the speed regime, while purple segments indicate if the vessel can safely navigate at any speed within the flexible interval.

Flexible speed intervals can be configured per port in the Settings > Calculation settings > Flexible speed intervals module.

When associated routes are calculated, the Tidal window diagram shows a restriction line for each route. The line is placed where the associated route diverges from the original route, and indicates when it would be unsafe to start the associated route. Restrictions for associated routes do not affect the global tidal window(s) of the calculation.

The opening and closing moments of tidal windows for associated routes can be found in the Associated routes table. This table also shows the starting position and time for each associated route.