MACS3

Key takeaways

MACS3 belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect MACS3 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of MACS3 from memory before moving on to harder problems.

Reference excerpt

The MACS3 Loading Computer System is a computer controlled loading system for commercial vessels, developed by Navis Carrier & Vessel Solutions. Prior to October, 2017 it was offered by Interschalt maritime systems GmbH, and before 2007 - by Seacos Computersysteme & Software GmbH. MACS3 consists of computer hardware and a range of software, which aim to minimize the operational load while loading a vessel, and to prevent any hard limitations from being breached.

Design principles The software architecture and user interface of the MACS3 Loading Computer System are designed according to the standard ISO 16155:2006 Ships and marine technology - Computer applications - Shipboard loading instruments, and to the following Rules and Recommendations:

DNVGL Class Guideline DNV-CG-0053 : Approval and certification of the software of loading computer systems ABS Guidance Notes for the Application of Ergonomics to Marine Systems BV Rules for the Classification of Steel Ships, Pt C, Ch 3, Sec 3 "COMPUTER BASED SYSTEMS" IACS Recommendation on Loading Instruments (No 48) IACS Unified Requirements (No E27) Cyber resilience of on-board systems and equipment Beside proprietary mxml format, MACS3 (as well as StowMAN planning tool from Navis) does support EDIFACT formats (implemented according to the Ship Message Design Group (SMDG) recommendations ) and Digital Container Shipping Association (DCSA) standard for Load List and Bay Plan

Software structure The software of MACS3 Loading Computer System includes the MACS3 Basic Loading Program, performing functions of Categories A and B according to the ISO 16155:2006 and (optionally) a range of, performing functions of Category C:

PolarCode Basic Module BELCO Container Management Module DAGO Dangerous Goods Modules StowMan Stowage Planning SEALASH Lashing Module MIXCARGO General Cargo Module RoRo Roll-on/roll-off Module Crane Operation Module Bulk Carrier Modules Tanker Modules BallastMAN Ballast Water Exchange Module Voyage History DastyMAN Damage Stability Online Program (Tanks Online) Mooring Module Squat effect Module The system runs under Windows 10 or 11 Professional 64Bit.

Programs and Features

MACS3 Basic Loading Program MACS3 Basic Loading Program is designed for all ship types (containership, tanker, Bulk carrier, general cargo, RoRo, Passenger ship) in accordance with the unified IACS Requirement L5 "Onboard Computers for Stability Calculations". It is approved by all leading classification societies: LR, ABS, DNV, BV, ClassNK, KR, CCS. MACS3 Basic Loading Program performs:

Ship stability and strength calculations, covering all pertinent international regulations like e.g. IMO A.749 Numerical and graphical results for metacentric height GM, trim, heel, draft, shear forces, bending moments and torsion Metacentric height GM check against various approved GM requirement curves GZ curve for dynamic stability Automatic wind pressure calculation Automatic ballast tank optimization Tank plan with visual editing Optional online measurement of tank levels and draft (sold separately) User interface with tabbed main window for multiple views, all fully customizable Screen and print reports in PDF, HTML and XML formats MACS3 Basic Loading Program supports client–server software architecture for distributed cargo management and allows the complete loading condition (containers, tanks, general cargo and constant items) to be stored in a single compressed mxml-file, making it very easy for you to exchange loading conditions between ship and office.

BELCO Container Management Module BELCO enhances the MACS3 Basic Loading Program with easy-to-use container management features, enabling to create the valid Stowage plan for container ships. It works with high level of integration into MACS3.NET, so any changes to the container cargo are immediately reflected in the MACS3 stability and strength calculations. The results of the MACS3 and BELCO can be displayed simultaneously at any time. The MACS3 screen and print reporting in PDF, HTML and XML formats is also fully available to BELCO. Data Features:

Verified Gross Mass (VGM) functionality Variable container sizes Wide range of information per container: ISO 6346 (both old and new) and custom types, weight, ports of loading/discharge/final/transshipment, operator etc. Calculation of vertical, transversal and longitudinal centre of gravity for each container Full UN EDIFACT/BAPLIE support (BAPLIE 1.5, 2.0, 2.1, 2.2 and 3.1) UN LOCODE database Port rotation with date/time and quays Cargo Handling

Efficient pre-stowage and pre-discharge functions, bay-, row-, tier- or port-wise Visual editing of reefer positions and hot areas Loading/discharge list Plan view Fully functional layer view Fully functional single page view Top view with various criteria Block shift Multi-step Undo Hatch-cover handling Symbolic presentation of pier Result table with free selection of row/column criteria, including sub-rows, sub-columns and subtotals On-the-fly and combined checks:

Visibility (IMO and Panama Canal) check with blind sectors in relation to trim/draft change Segregation of Dangerous goods, Restows, Lashing forces, Lashing inventory, Stack weights (maximum stack weight according to the shipyard, as well as 20' stacks weights in holds according to the Classification Societies), "Flying" containers, Reefer plug positions, Hatch cover clearance, Compatibility of container types with ship design, Load and destination locations according to the UN Locode databases and to the Port Call List, Overdimensions, Handling instructions and Loading Remarks (like "away from boiler", "on-deck-only"), Container numbers, False empties, etc. Visualization

Multiple bay views with individual settings Visualization of hatch covers and tweendecks About 150 different container criteria for visualization and statistics Up to 12 information areas with text per container Containers can be coloured by a variety of criteria, e.g. by port of discharge Multiple colours per container Longitudinal section and top view with tanks, holds, containers and visibility lines Commodity list with possible restrictions Realistic 3D view – both Helicopter and Personal (Walking) modes

… excerpt ends here. Continue reading the full article.

Worked examples

Example 1 — a first encounter with MACS3

Start with the simplest possible case. Write down what MACS3 claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to MACS3 before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about MACS3 ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of MACS3

In research: MACS3 appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses MACS3 in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: MACS3 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Port infrastructure, Transport software, so understanding it makes those chapters shorter.
In everyday life: Look for MACS3 outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

How to study MACS3 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what MACS3 means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain MACS3 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is MACS3 in simple terms?

The MACS3 Loading Computer System is a computer controlled loading system for commercial vessels, developed by Navis Carrier & Vessel Solutions. Prior to October, 2017 it was offered by Interschalt maritime systems GmbH, and before 2007 - by Seacos Computersysteme & Software GmbH.

Why does MACS3 matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study MACS3?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on MACS3.