Category Zone of Confidence (CATZOC) are the values that are used to highlight the accuracy of data presented on charts. Before the ECDIS era, mariners used to assess paper chart accuracy via Source Diagram. However, this was changed with the wider introduction of ENC's in the industry and the consequent introduction of CATZOC, which is described in IHO S-4 standard. Later allows accessing the ship's UKC numerically with regard to a given ZOC, which is reviewed in this article.

The webinars Risk Assessment & Permit to Work and COLREGS - the psychology of collision avoidance were held successfully and the webcast is available!

We decided to make a post, which contains useful information on ECDIS. This will be the work in progress and we are going to refresh and add content periodically. You are welcome to click and check for ECDIS news here from time to time.

Dear colleagues, together with our partners Key4mate we are planning to hold the webinars on following subjects:

- Risk Assessment & Permit to Work

- COLREGS: Psychology of Collision Avoidance

Check out the full article for details...

A story as old as time, like Shakespeare's “To be or not to be?” This is, probably, one of the most remarkable quotes in classical literature. How many times in situations related to the collision avoidance, we ask ourselves what action to take will be best?

Learnmarine is proud to provide our online assessment system and training services on Azimuth Stern Drive (ASD) tugs maneuvering, towing and escort operations to the Kazakhstan Maritime Academy.

Every mariner at some point in their career has heard a story about a captain or mate prevented a critical situation from becoming worse. Perfectly solved this critical situation becomes a hearsay via “marine radio”. However, what about you or all of us? Are we ready for the crisis or critical event which out of standard routine duties at sea? At the end of the day, we are all humans who are not free of emotions. If we are not ready for some unexpected situation if something goes outside of the loop, emotions and fatigue are ready to take over the common sense in the decision-making process, ignoring even key safety aspects.

Learnmarine took part in development and deployment of tailor-made training on Azimuth Stern Drive (ASD) tugs maneuvering, towing and escort operations inside the walls of Kazakh-British Technical University.

The Maritime Authorities of the Tokyo and the Paris Memoranda of Understanding (MoU) on Port State Control will launch a joint Concentrated Inspection Campaign (CIC) on SAFETY OF NAVIGATION. The aim of the CIC is to check compliance with the applicable requirements of the SOLAS Convention, the overall status of the vessel’s navigation safety, and the competency of crew involved in navigation operations.

This inspection campaign will be held for three months, commencing from 1 September 2017 and ending 30 November 2017.

One of the navigational officer’s duties during route planning and execution is to check the route for the presence of temporary hazards: seismic vessels with a 10 km cables, drifting containers, oceanographic works, firing, etc.

If a vessel is in the same area for a long time, then tracking routine messages by NAVTEX or INMARSAT C is not difficult, and you are usually well familiar with the situation. However, if you transfer to a new area, you need to get the most updated information for a passage plane.

Yes, all these years we try to prepare for you information on navigation, and we sincerely hope that it will be useful and interesting. Together with you, we have mastered navigation, astronomy, ship management, GMDSS, and safety techniques even better. And for this, dear colleagues and readers, I want to say thank you to you. And yes, we get feedback from you, we see at meetings, we communicate from time to time through social networks ...

Can navigational charts be trusted? Any of them: paper, raster, vector, ENC’s? Nope! – they all have to be doubted, you can only trust your own eyes.

When we talk about ship position accuracy we are mainly referring to the navigational equipment errors. This includes GPS (global positioning system), which can provide continues fix of position within accuracy of 10 meters. However, to date, there is still a number of problems associated with the accuracy of displaying cartographic information, both on paper, and on electronic charts.

Lets discuss some pitfalls that should be avoided during depth measurements.

We all know: echo sounder is a depth-measuring device. Its transducer is usually installed at a ship’s bottom in forward part. That’s why the depth measured with echo sounder is by default may be considered as the depth under keel (or UKC – Under Keel Clearance), although it is called DBT – depth below transducer.

Nevertheless, echo sounder readings are not always DBT, and DBT is not always UKC.

I would like to dedicate these posts to some subtleties of work with navigation equipment, which you begin to understand well and clearly only with experience. It doesn’t matter how long did we listen to that in the classroom, the understanding of the nuances comes to us only when we see it, try it and face faults and malfunctions. And there are a lot of them even on the most modern Hi-Tech ships.

The first among all others I’d like to write about are the heading sensors or compasses.