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Ship's Squat/UKC/Speed Loss And Tide Calculations®
ePrice Trial Version Further Information
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There have been 296 groundings over the past years which have incurred a cost more than USD 10,000 with an average cost of more than USD 1,100,000 for all vessel types. The cases of groundings have often been caused by a lack of assertiveness and proper briefs before arrival or departure as well as a lack of pilot brief.

By predicting the maximum ship's squat for a given situation, the advantages that can be gained are numerous, from saving the cost of a very large repair bill to even extra earning capacity. With this unique Option, you can have calculated your ship's squat in several speeds, as well as the under keel clearances, the speed loss in restricted waters and your vessel's static condition from dynamic drafts.

Ship's Squat / Under Keel Clearance / Speed Loss at Restricted Waters & Static Condition from Dynamic Drafts / Calculation of Safe Speed / Tide Calculation is based on Dr. Bryan Barrass, using the Admiralty Digital Publications SDK from UKHO.

This module incorporates the Tide Calculations, an option, which is using the Simplified Harmonic Method of Tidal Prediction (uses Harmonic Constants Published in Part III of these Tables and the Tidal Angles and Factors from Table VII ) and various Inputs and calculates Tide of Height and UNDER KEEL CLEARANCE (UKC) .

NOTE: The clients, who are already registered with United Kingdom Hydrographic Office concerning the Admiralty Digital Publications SDK, can make of use the Harmonic Data (Digital Tide Tables) for a particular location (Port) as an add-on (Communication Protocol) to our software in order to avoid the manual input of Harmonic Constants.

This module includes the STATIC CONDITION FROM DYNAMIC DRAFTS feature that will assist in determining the Ship Static Drafts obtained from Dynamic Drafts due to Squat vs Current Speed in open water and confined channels.

UNDER KEEL CLEARANCE (UKC) calculation takes into account all the Vetting Inspection Questionnaire/OCIMF requirements, such as:
  • Changes in the predicted tidal height, which are caused by wind speed and direction and high or low barometric pressure.
  • Nature and stability of the bottom - i.e. sand waves, siltation etc.
  • Accuracy of hydrographic data, (References to reliability is often included on charts).
  • The reliability of draft observations and calculations, including estimates of hogging and sagging correction.
  • Reduced depths over pipelines and other obstructions.

As well as:
  • Swell Height.
  • Tidal Height .

Features of ship's Squat/UKC/Speed Loss And Tide Calculations © at restricted waters & static condition from dynamic drafts for vessel and office application like:
  • Compliance with the management framework/system for Under Keel Clearance Management in certain areas (ie. Torres Strait/AMSA, etc.).
  • Ship Static Condition from dynamic drafts.
  • Table Results with calculated Ship Squat, UKC and dynamic drafts vs Speed along with graph figures.
  • Calculated grounding Speed, the Safe Speed, the Grounding Area and the Loss of Speed.
  • Table Results with calculated Ship Static Drafts.
  • Third Party warranty for the correctness of the results as per shipyard's documentation.
  • Literature notes on how the ship's Squat affects the vessel's behavior.
  • Calculation Algorithms for both Open and Confined Waters.
  • Generation of Curves (ie: UKC vs Ship speed).
  • Immensely useful printout for Pilots Masters in navigation operations and in pilotage at ports.
  • Print-out options.
  • In-house development.
  • Automatic synchronization of data between vessel and office.

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