It carried out maneuvering trials of Nippon Maru by the revision of cadets training curriculum since the time of construction. We have gotten different facts from the original maneouvering trials on the maneouvering performance at the ships low speed after renewing the main engines control unit in June, 2015, therefore we report here.
A new crash astern program and automatic disengagement of the engines clutch were deployed by renewing the engines control units. The engines is controlled automatically even if using emergency astern engines, and the risk of stopping the engines is greatly reduced.
A 30 mm × 45 mm size amplifier integrated printed circuit board antenna (also called a probe) developed by Roelof Bakker was manufactured to receive a LF band of 136 kHz, which was recently approved for use in amateur radio.
It has been verified that this antenna is effective not only in the LF band but also in the MF/HF band (300kHz to 30 MHz) and part of the VHF band (30 MHz to 150 MHz).
Although MF/HF band is not the main use in the ship communication, it still occupies an important role for safe navigation of ships, like reception of emergency radio signal transmission, SSB telephone, NBDP (character communication), FAX reception, DSC reception, NAVTEX reception and radio broadcasting reception,.
In general, MF/HF antennas are larger than other frequency bands antenna. Therefore, as these antennas become smaller, there are many points that can be useful, such as maintainability, aesthetic appearance, and suppression of obstacles during shipboard operation.
This time, I tried to construct a system with an LC resonance circuit filter and automatic tuning by a personal computer with this antenna with many noises in MF/HF use.
I report the effectiveness of this prototype antenna as a commercial radio reception used in a ship.
Some papers had been published on Analysis of Navigation Record and Sailing Performance of NIPPON MARU and KAIWO MARU. And around 10 years has passed since latest one was published. Therefore We reanalyzed them adding the latest 9 times data of Navigation Record. The results are follows;
1. In comparison low latitude route voyages with high latitude route voyages, the sailing speed and the sailing rate in high latitude route voyages are higher than in low latitude route voyages.
2. The success rates of landfall on sailing is almost no difference. between low latitude route and high latitude route, It is impossible to say definitely that high latitude route have advantages.
3. In recent voyages, the low latitude route are prefered to the high one. Because unusual weather what often occurs in recent years were took warning.
4. The relationship between ENSO(El Nino and La Nina) and success rates of landfall is definitely. The success rate of El Nino term is 86% Unsuccess rate in La Nina term is 83%.
5. When Zonal Index is low, the atmospheric depression develops in middle North Pacific Ocean and be apt to proceed eastward more than ordinary. And during this term, migratory anticyclone tends to proceed to the lower latitude than ordinary.
6. The area where perils of the sea and heavy weather occurs easily is within the limit of 30~35N , 140~160E.
According to the above, we suggested a possible route to keep out of rough sea and gain moderate wind to reach Hawaii only sailing. The route is composed following 4 part;
1. Choosing a suitable starting point of sailing.
2. Selecting the possible route to reduce the risk in rough sea.
3. Selecting optimum route to get good sailing speed.
The purpose of this study is a proposal of analysis method about troubles of cadets in the training ship. The cadets in the training ship differ from students in land in that cadets spend the day with same members. Therefore, cooperation attach importance to life in the ship. There is a possibility that cadets leave over their troubles, for their trouble disorganize the cooperation in the ship. Consequently, instructors have to share the knowledge about what kind of troubles they have and how to cope with them for they acquire the nature and the ability required as seaman.
ERM training, which is a non-technical skill, was enforced in Manila amendments of International Convention on Standards of Training, Certification and Watchkeeping for Seafarers (STCW) in 2010.
On our training ship(Japan agency of Maritime Education and Training for seafarers: JMETS), Be carried out lecture on the principles and ability requirements of ERM, Conduct evaluation about Engine room watchkeeping, maintenance work and operation machinery by observation. But we sensed that the trainees were unable to understand the training attitude of these non-technical skills. Therefore, we tried to improve awareness of the contents of ERM training.
In this study, we report the result of verifying the awareness raising effect of ERM training with engine room simulator.