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Protected: A simple method of selecting the right anchor for mooring a vessel

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Designing a simple 4-point lashing system for a Deck Cargo

Introduction Lashing of a deck cargo on a ship involves different means and mechanisms to secure the cargo to the deck of the ship. This ‘securing’ is important to contain the movement of the cargo in view of the ship motions during the transportation. The simplest...
Mooring Ship Design MBL Calc OCIMF MEG4

Calculating a Ship’s Design MBL using OCIMF MEG-4

In Part 1 of this article, we saw a step by step guide to calculate the Environmental forces on a vessel based on “Standard” environmental criteria defined in Section 3 of OCIMF Mooring Equipment Guidelines Fourth Edition (MEG-4) in order to determine the ship’s...

Selecting the right equipment for towing operations – Emergency Towing

In Part 1 of the article, we discussed the regular towing arrangements and how to select the towing gear for the same. In this part, we will discuss the components of the emergency towing arrangement and how to select them. The purpose of emergency towing equipment is...

Preliminary Rigging Arrangement Design OF 4 point, Single Hook Lifts for Non-Specialists

by Michael Harwood, PE, PMP Overview Lifting by crane is a basic construction operation that dates back to at least Sixth Century BC (ancient Greece for example) and the lifting operation itself dates back much further. It is a very common operation in present-day...
Article on autonomous ships - TheNavalArch

Autonomous ships of the future

Automation is in good servant but a bad master!By Dr L R Chari, ex-Executive Director of Shipping Corporation of India (SCI)*This article originally appeared in June 2018 edition of Marine Engineers Review (India), the Journal of Institute of Marine...

The digital transformation of the maritime domain

(This article originally appeared in June 2018 edition of Marine Engineers Review, Vol 12, Issue 7, Journal of The Institute of Marine Engineers (India), and is being reproduced here for readers of TheNavalArch's blog)The maritime domain is gradually...

Selecting the right gear for towing operations – Part 1

Towing operations seem pretty straightforward – we just need to connect the vessel to be towed to the right sized tug and get started!However, a simple exercise of digging deeper will reveal critical items that we need to take care of. If we start thinking about the...

Removing Human Error in Ship Performance Analysis

Introduction Shipping is the most dominant means of transport that facilitate global trade. Over 90% of world trade is done by ships[1]. Fuel onboard ships, commonly referred to as "bunkers", has become the largest cost item of a ship's Operational...

OCIMF MEG-4 and Mooring Design of your vessels – Part I

Part 1 – Environment and Environmental forcesThe OCIMF (Oil Companies International Marine Forum) has come out with the latest edition of mooring Equipment Guidelines (MEG) – Rev 4. This revision incorporates significant changes and updates over the MEG-3,...


Excellent and Reliable

Dear TheNavalArch,

CCTO is an almost 40 years Naval Architects company operating in the world wide Shipping industry as technical consultants with a significant variety of projects in our portfolio.

Six years ago we ascertain existence of your first products and we immediately decided to make use of them. The experience gained over the years is,

  • The software  you are developing are of an extended application  in our activities and every day questions we have to deal with. Let’s call this as ”LARGE SCALE “ application products”.
  • The Rules & Theory your products are based on are most reliable and of vast acceptance by the entities our projects are reviewed. Let’s call it as “RELIABLE & SAFE”.
  • The support we had from your side in each and every case we had a question was “EXCELLENT”.
  • Last but not least Your pricing policy is more than “FRIENDLY”

Please use our comments as an incentive for more products development in same spirit as above, assisting our activities.

Costas Carabelas
C.C.T.O. (Costas Carabelas Technical Office), Greece

Fine job..

You do a fine job of explaining the methodology and inputs to your spreadsheets which allows our people to make effective use of them immediately. We will certainly continue in the future, to purchase your products

Robert P. Hill, President
Ocean Tug and Barge

Time savers…

Just a note on the TheNavalArch’s programs, I have several and find them very well done, especially helpful is the very detailed analysis presented with each program (and the very reasonable price). The programs are real time savers and pay for themselves after a single use. The detailed outputs are well organized and ready to be included directly into engineering reports as is, with no modifications or editing required. I also find the articles on various topics sent out from time to time to be very informative and useful also. 

James Andel
P.E., Civil Engineer

Practical, straightforward…

I have been using the TheNavalArch’s spreadsheets already for many years in the maritime salvage industry with great pleasure.

They are practical, straight forward, understandable, written in a plain language and in line with the actual regulations of classification bodies.

Theo Haak, Owner
Haak Consultancy Salvage

Professional work…

Just wanted to thank you for your assistance with the two technical analyses we conducted recently.

I was pleased with the work provided, which was very professional. In addition, your response to enquiries and requests for further analyses was always prompt, which was very much appreciated.

I look forward to working with you in the future.

Tony Laubreaux
Laubreaux Marine SARL

Better than the software I am used to…

Your spreadsheet is great, even better that the software I am used to.

I am using it in order to design fenders for a new Harbour in Montevideo.

Jose Zorrilla
Civil Engineer,ACI,NACE

Great to have a double check…

So far I have downloaded Lug and Cargo forces spreadsheets and use them daily and find them very useful.

I get similar results with my own spreadsheets so it’s great to have a double check as its very easy to make a mistake in a spread sheet

Kris Decke, Design Engineer

Reliable engineering apps…

TheNavalArch’s products have been handy for us in getting reliable Engineering Calculations for critical Marine Operations like Mooring, Loadout and Towing which we carry out on a regular basis.

The Technical Support is prompt and helpful in clarifying doubts and queries. Technical Consultancy provided for Critical Loadout operations involving Ballasting and Stability Calculations have helped us deliver our projects timely.

Capt Kulwant Singh, Managing Director
EkOne Safety and Marine Management Pte Ltd, Singapore

Helpful in operations…

Thank you for the outstanding help we received during our project.

Your products have also been helpful to us in our operations.

Highnet Marine Technology(HMT, Korea)

Hi There!

Welcome To


We endeavor to become the richest hub for quality online resources for the Marine and Oil & Gas industries. We currently house an array of marine calculators which are handy and easy to use in design and operations. You may also wish to checkout our technical Articles which are in-depth and written by some recognized industry experts.

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