Saturday, February 5, 2011

THE NAIVE SAILOR, GPS -- CAPT AJIT VADAKAYIL


When i first commanded a ship 28 years ago, my ship did NOT have a Satellite Navigator. We took celestial sights with sextant.

So i wrote to the Chairman of the company ( a political post ), telling him to stop all these bullshit seminars for saving fuel.

I made it clear that the shortest distance between 2 points on a globe , is a Great circle or a rhumb line.

He replied to my letter and said , he will ensure all ships will soon have a Satellite Navigator.

So my next ship had a American NCS dinosaur Satellite navigator which gave only about 16 positions a day at the equator, and maybe 50 positions a day in very high latitudes. The accuracy was poor.

I got a GPS on my ship only as late as 1990.  So as soon as it was fitted i gave orders to start a new style GPS log. It contained the following columns.

Date/ time in SMT and GPS UTC ( recordings at every 30 minutes max interval )
Lat/ Long
GPS speed
GPS course made good
Propeller speed
Gyro course steered
WGS84 correction applied Yes/ No
Remarks/ Sign

Even in 2010 i had the same format GPS log.

All vetting inspectors , PSC , Shore powers consider it a crime if the OOW trusts the GPS. They say-don't trust the dang thing.

Capt Vadakayil says-

 " YOU CAN TRUST YOUR GPS , PROVIDED YOUR COMPARE :--


THE GPS COURSE WITH GYRO COURSE -- CORRECTED FOR ERROR 

THE GPS SPEED WITH PROPELLER SPEED -- ALLOWED FOR WEATHER

AND WGS 84 CORRECTION.

If the GPS gives wrong positions , the comparison will be haywire-- absolutely. GPS pings the ship every few seconds, if the speed and course don't change this means your antenna has fallen off. So many ships have run aground because they were on the DR mode as GPS did NOT give any inputs.

There are 31 active GPS satellites plus 2 spare ones at a height of 19300 kms. You just need 4 for a trilaterated fix. They make 2 circles of the earth every day.

On two ships , on the very first day I found a difference of 5 degrees between the GPS course and Gyro course at sea , with smooth weather, prompting me to take an amplitude of the sun. And then i get a gyro error of 5 degrees --this means all and sundry were deliberately giving bull in the gyro error log.

On both these ships ( both had finished 2 years of sea voyages since delivery ) i got the master gyro foundation bolts loosened at the next port and turned it using a shore bearing, and re tightened it. For calling a Gyro technician would be of no use.

People say GPS will stop working during sun flares, Well since i got my first GPS , it has NOT let me down except twice at Sicily ( gun runners jamming using Soviet jammers) during the Serb war.

And then once i joined a fast container ship capable of doing 26 knots. The Japanese Engineering owners superintendents were very nasty and arrogant men , who used to treat the previous Chief Engineers, Masters and Tech Managers Tech Engr Suptds in a shabby manner. It had a racist tinge.

 I saw lengthy correspondence when i went to the company HO for pre-joining briefing. Even the MD asked me to take care not to overload the engines and get the squeamish Japs upset. And then they went around explaining a stupid Jap load envelop main engine power diagram.

Soon enough i get a stinker after one noon message from the Jap owners ( their name sounds like what you wear on your feet ), accusing me of overloading their precious engine.

I gave them such a severe bollocking by email-- that they let us alone after that, for ever.

No more taking out frustrations on ship, by these split personalities. ( ever seen a Jap blue movie?--it is all the same!-- it is NOT about making love, it is about torturing the poor girl and making her cry and whimper ).

I wasted no time in telling them that their load diagram and power calculations has NIL intelligence.  I said , that i use my GPS to find out the engine load every second--NOT every 24 hours at noon .

The GPS immediately tells you  the engine load, even if your propeller gets caught in a fishing nets or if a large helm is given at 26 knots. My standing orders on bridge contained the sentence " If the difference between GPS speed and Propeller speed exceeds by so many percent, i must be informed".

At anchor put the GPS and the radar into plotter mode, and the pattern tells you the way the ship behaves ,and also how the anchor is holding. You can zoom in to few metres . So next time when the stupid pilot wants the GPS speed while approaching berth, on a turning ship, caution him it is the speed of the GPS whip antenna over the ground--NOT the ship as a whole.

The GPS and the radar must always be used in a man overboard situation , by pressing the MOB button and then going on plotter mode.

I bought my own Magellan portable GPS from a US naval store at Honolulu, in 1984. Nowadays i don't carry  my GPS on board as we have several GPS sets hooked on to almost every GMDSS set.


India will put her own 7 GPS satellites ( IRNSS )  by 2016, making her the 4th country in the world to have it.


Digression: Only ignorant engineers calculate ME power from Turbocharger parameters. The best way is to use the fuel rack method.

EXAMPLE:


Formula for engine output:         

Le   =   K x Ne x Hua x γa        (PS)                        
                             Hu x γ                                               

where
Le      = Engine output                                                                                 
Ne      = Engine speed (rpm)
K        = Torque factor taken from graph in shop trial data manual                                             
Hua     = Lower calorific value of fuel oil in the ship (kJ/kg or kcal/kg)
Hu       = Lower calorific value of fuel oil at shop trial (kJ/kg or kcal/kg)
γ a       = Specific gravity of fuel oil in the ship at the engine inlet temp.
 γ         = Specific gravity of fuel oil at shop trial at the engine inlet temp. 
 Rc       = Fuel injection pump rack ( mean value) = 65.8


 K value from graph Rc vs K  = 47.6
 Sp. gr of fuel oil in use = 0.9773 at 15 º C
 γ a = Sp. gr of fuel oil in use at engine inlet temp of 129 º C = 0.8987
 γ    = Sp. gr of fuel oil at shop trial = 0.8666
 Hua = 40.67 MJ/kg  from fuel oil analysis report of Fuel analysis lab
                        = 40.67 x 1000 kJ/kg = (40.67 x 1000)/4.2 kcal/kg
                        = 9683.3 kcal/kg.
                               
          Le  = 47.6 x 150.7 x 9683.3 x 0.8987     = 7132.11  PS
                                10100 x 0.8666





CAPT AJIT VADAKAYIL
..

2 comments:

  1. CH
    October 13, 2014 at 6:35 AM
    Respected Captain,

    What is special about Tamil Nadu?

    How come it is able to continuously produce word geniuses like Ramanujam, Subrahmanyan Chandrasekhar, C.V. Raman, A.R. Rahman, Abdul Kalam, Venkatraman Ramakrishnan, Viswanathan Anand, Illayaraja, etc?

    Even till recently the Chief Justice of India, the Finance Minister, the RBI governor are all Tamils?

    Is there any scientific reason behind this? Because no other region has produced such super genius people in such numbers.

    Regards

    ReplyDelete
    Replies
    #####################
    Capt. Ajit Vadakayil
    October 13, 2014 at 7:06 AM
    hi ch,

    i am sure if i were a lawyer, i will NEVER EVER become CJI.

    i am sure if i were an economist, i will NEVER EVER become finance minister.

    you want me to continue ?

    when i was on my training ship in mumbai with 250 other cadets ( two years ) -- the biggest TELUs ( oily and slimy ) and SNEAKS ( snitches ) became SCC ( senior cadet captains ) , CC ( cadet captains ) , CL ( cadet leaders ) etc.

    i used to be in the CAPTAINS MONTHLY BREAKFAST PARTY ( cadet with maximum negative marks for OFFICER LIKE QUALITIES ) -- to be chewed up for breakfast every month .

    i got an EXTRA FIRST in every subject --except OFFICER LIKE QUALITIES.

    now what are OFFICER LIKE QUALITIES-

    being a son of a bit#h, being a sneak, being a hypocrite, being a as$ kisser , being a leader who will sell out his team, being a back biter, being an informer , being the best in playing to the gallery.

    so, so--

    at the passing out parade --most of the cadets who got all PRIXES were leaders -- they all got BOOOOOEEEEED !

    I remember i got only one prize--for being the best REPORTER IN ENGLISH -- the claps I got from the entire hall still resound in my ears -- along with another ROC ( royal officer cadet -who did NOT care to become a sold out leader ).

    and mind you -- i was in every single team which made my TOP ( starboard fore top ) the champion TOP.

    i was a champion sailor, rower, signaller, marks in subjects, soccer team in both years --

    but i lacked OLQ ( officer like qualities ) of being a FU#KIN' SLIME BALL.

    so in my passing our certificate , after two years of training -- i had an EXTRA FIRST in all subjects -- except OLQ where i was third grade

    so i guess they held a special meeting and GRACED ME TO FIRST CLASS --a young 18 year old boy -- .TEE HEEE !

    AT SEA, THE SAILORS DO NOT CARE FOR YOUR FOUR STRIPES- THEY ONLY CARE FOR WHO YOU ARE--

    AT SEA PEOPLE WHO KNOW ME , OR HAVE HEARD OF ME -- OR SAILED WITH ME, WILL VOUCH--

    CAPT AJIT VADAKAYIL WAS A SLAVE MORE POWERFUL THAN THE MIGHTY FU#KIN' CAESAR -- BY LIGHT YEARS .

    this has now passed on to LORE -- never ti happen again in the annals of sea .

    am i boasting ?

    -- so be it !

    humility is NOT about having a low opinion of yourselves to please the JEALOUS party.

    see, this would have been part of my post-- GAMES CAPTAIN PLAYED--

    you made me reveal it prematurely --with your TAMIL PRIDE ! TAKE IT EASY !

    check out my training ship-

    https://www.youtube.com/watch?v=MwpFBPMtnj4

    https://www.youtube.com/watch?v=k0BxC3kFET8

    capt ajit vadakayil
    ..

    ReplyDelete
  2. Capt. Ajit Vadakayil
    October 15, 2014 at 7:00 PM
    STOP PRESS:

    I AM WRITING THIS AS I PROMISED ONE OF MY READERS 45 MINUTES AGO-- HE RAN UP TO ME DURING MY MORNING WALK--

    HE WANTED TO KNOW OUT OF MY 300 PLUS SCOOPS IN MY NEARLY 845 ODD POSTS--WHICH IS NO 1 AND WHICH IS NUMBER 300.

    ############

    well let me make it clear , these 300 scoops are CONSTRUCTIVE SCOOPS .

    all these 300 scoops are in the plane of INVENTION and NOT innovation.

    none of these 300 scoops are DESTRUCTIVE -- so my posts proving that edison, newton, darwin, einstein etc are IDIOTS does not find a place in these scoops.

    so waht could be the no 1 scoop?

    it is about providing a HINT on how to make a astronaut hibernate while travelling to mars -to cut down on food and water .

    it is about keeping alive a seriously wounded soldier till he can find proper medical care.

    punch into Google search-
    HIBERNATION WITH HYDROGEN SULPHIDE GAS VADAKAYIL

    and

    FUMAROLES FOR FREE ENERGY AND HYDROGEN SULPHIDE SUICIDES IN JAPAN VADAKAYIL


    one of my russian chief engineers who lived near siberia , a place infested with HUGE bears had once woken up a bear while on hibernation in a cave ( as a child ) and he told be how furious the animal was. Before they go into months of hibernation they would kill a large animal ( bury the dead animal it in the ground ) and would NOT eat it unless it became putrid , reeking of rotten eggs..

    WELL WHAT WOULD BE NO 300 RANK.

    it is about PIN WORMS on as$hole.

    Check out the comment dated 18th Dec 2013 , about surcharging the anus with oxygen 5 times a day to prevent pinworms disrupting your REM sleep. This is a 6000 year old Ayurvedic cure for pinworm which happens when you eat non-veg heavy meats and do NOT wash your as$hole after a crap.
    Punch into Google search-
    VEDIC PRACTISES IN MECCA VADAKAYIL

    If I were a white JEW, I would have been an international celebrity. but then who cares?

    I have reached a stage where ONLY I can evaluate myself--

    one of my DUTCH bosses tried to patronise me nearly 2 decades ago -- he said he has given me a good confidential service report-

    so i told him something in Hindi -- with its translation.

    VADAKAYIL KHUD QUESTION PAPER SET KARTA HAI !

    VADAKAYIL KUD EXAM LIKTHA HAI !!

    VADAKAYIL KHUD NUMBER DETA HAI !!!

    capt ajit vadakayil sets his own exam question paper, he writes the exam , and then he gives himself the marks .

    THIS IS THE MEANING OF LIBERATION.

    believe me -- that man hugged me ( NO patronising here ) and said -- he expected such an frank retort from me .

    he said- every other captain would have said thank you .

    he was told to enter into this dialogue by the single man owner of that shipping company . this was about my " CUT THE CRAP " EMAILS -- where i would point out that the EMPEROR IS NAKED .

    99% of the people will NOT even understand the wisdom and gravity of the statement above.

    capt ajit vadakayil
    ..

    ReplyDelete