1. 2nd MATES ORALS QUESTIONS SET
IMDG CODE . 3 DIFFERENT GOODS:
U. N. NO. 1779. 2. PSN (PROPER SHIPPING NAME) FORMIC ACID
PACKING CATEGORY / PACKING GROUP
ACTIONS IN CASE OF FIRE UNDER DECK ( F- A) :
I) CARGO FIRE ON DECK : CREATE WATER SPRAY FROM AS MANY HOSES POSSIBLE.
II) FIRE UNDER DECK : STOP VENT AND CLOSE HATCHES . USE CARGO SPACE FIXED FIRE
EXTINGUISHERES SYSTEM. IF THIS IS NOT AVAILABE CREATE WATER SPARY USING COPIOUS QUANTITIES
OF WATER.
SPILLAGE ON DECK (S-A) WASH OVERBOARD WITH COPIOUS QUANTITIES OF WATER. DO NOT DIRECT
WATER JET STRAIGHT ONTO THE SPILLAGE . KEEP CLEAR OF EFFLUENT. CLEAN THE AREA THOROUGHLY .

2. SPILLAGE UNDER DECK: KEEP BRIDGE AND LIVING QUARTERS UPWIND . PROTECT CREW AND LIVING
QUARTERS AGAINST CORROSION.
MASON’S HYGROMETER :
STEVENSON SCREEN : DRY BULB AND WET BULB TEMP., MUSLIN, COTTON WICK, CONTAINER OF
DISTILLED WATER.
THE DIFFERENCE BETWEEN THE DRY AN WET BULB READING IS KNOWN AS THE DEPRESSION OF THE
BULB.
SITIN OF MASONS’S HYGROMETER/ MARINE SCREEN : I) BRIDGE WING II) HUNG TO WINDWARD III)
CLEAR OF VARYING AIR FLOWS CREATED BY THE V/L. IV) 1.5 MTRS. ABOVE DECK V) AWAY FROM
HUMAN INTERFERENCE.
GYRO COMPASS : A NON-MAGNETIC COMPASS GIVING TRUE NORTH AND BEARING FROM IT BY MEANS
OF GYROSCOPE.

3. GYROSCOPE : A WHEEL OR DISC MOUNTED SO AS TO SPIN RAPIDLY ABOUT AN AXIS WHOSE
ORIENTATION IS NOT FIXED. BUT IS UNDERPERTUBED BY TILTING OF THE MOUNT, ESP. USED IN
STABILIZERS, GYRO COMPASSES , NAVIGATION SYSTEMS, ETC. GYROSCOPE.
PARTS OF GYROSCOPE : BEARING, METAL GUARD, GYROSCOPE PROCESSES, SPINNING WHEEL AXIS ,
MOUNT . GYROSCOPE – SPINNING OF ITS AXIS.
GPS : ERROR , SET UP AND LIMITAIONS: ERRORS: MULTIPATH ERRORS- BECAUSE OF LOCAL
OBSTRUCTION, IONOSPEHRIC EFFECT : SIGNAL PASSES THROUGH IONOSPHERE GETS SLOW DOWN,
CLOCK ERROR: TRANSLATE INTO TIME MEASUREMENTS, EPHEMERIS ( POSITION ERRORS) : CAN OCCURS
BETWEEN MONITORING TIMES , SELECTIVE AVAILABILITY: WHEN SWITCHED ON GPS, TROPOSPHERIC
EFFECT: LOWEST PART OF ATMOSPHERE, WATER VAPOURS SLOW DOWN THE SIGNAL .DUAL
FREQUENCY CAN OVERCOME THIS ERRORS., OPERATOR ERRORS: ENTERING THE WRONG AERIAL HT.
MUST BE CHECK V/L’S DRAUGHT . ENTERING INCORRECT DATUM.
SET UP OF G.P.S. : SWITCHING ON(TRAFFIC LIGHT), MANUAL INPUT, ANTENNA HT 2D, DATUM WGS-
84,CHECK DATE & TIME, CHECK DR POSITION, CHECK SAT. CONFIGURATION, CHECK SIGNAL STRENGTH,
CHECK HDOP FIGURE 38 db O.K., SYTEM ERRORS & DISPLAYED POSITION.
LIMITATIONS: GPS SAT ARE INCLINED AT AN ANGLE OF 55 DEG. TO THE EQUATOR, AND ALTITUDE OF
20,200K.M.

4. RADAR : WHEN U WILL USE SEA STABILISE: USE IN TRAFFIC ,CONFINED AND ANTICOLLISION .
RADAR SET UP IN R.V. : BRILLIANCE , CONTRAST, GAIN AND TUNNING.
ECDIS : CAN BE INTERFECED WITH OTHER NAVIGATIONAL EQPT. OR AS PART OF INTEGERATED NAV.
SYSTEM.
RASTER CHARTS; ARE FACSIMILE OR SCANNED REPRODUCTIONS OF PAPER CHARTS. ZOOMING CAN BE
DISTORTION.
VECTOR CHARTS: LAYERS CAN BE REMOVED . NO DISTORTION ON ZOOMING SCALE.
AIS : ADV & DISADV. : FASTER PREDECTIONS OF C.P.A. & T.C.P.A. AND IMPROVE SITUATION
AWARENESS. REDUCE SHIP TO SHIP VHF. COMMUNICATIONS. AIS IS AN ADD. NAV.AID.

5. DISADV.: IS NOT THE SOLE INFO. SYSTEM AT HAND. BE CAREFUL WHEN MATCHING AIS WITH OTHER
INFORMATION. IT DOES NOT MEAN A CHANGE IN THE COMPOSITION OF THE WATCH.
DWA? INCREASE I N DRAFT WHEN SHIP GOES FROM S.W. TO D.W. & VICE-VERSA.
FWA? INCREASE IN DRAFT WHEN SHIP GOES FROM S.W.TO F.W AND VICE-VERSA.
FORMULA OF DWA ; DWA = FWA * (DEN OF S.W.-DEN OF D.W)/ 25
BAROMETER? CORRECTIONS? : INSTRUMENTS IS USED FOR MEASURING ATMOSPHERIC PRESSURE.
CORRECTIONS : HT ABOVE M.S.L. AND INDEX ERROR.
HYDROMETER? : INSTRUMENTS IS USED FOR MEASURE THE DENSITY OF LIQUIDS.

6. HYGROMETER/HYGROGRAPH: INSTRUMENTS IS USED FOR MEASURING THE HUMIDITY IN THE
ATMOSPHERE.
ISM? THE INTERNATIONAL MANAGEMENT CODE FOR THE SAFE OPERATION OF SHIPS AND FOR
POLLUTION PREVENTION (INTERNATIONAL SAFETY MANAGEMENTS ISM)
CODE APPLY TO : ALL PASS. SHIPS. OF STATES WHICH ARE PARTLY TO SOLAS WHEN ON INT’L VOYAGE.
ALL CARGO SHIPS OF 500 GT OR VOER & MOBILE OFF-SHORE DRILLING UNTIS OF 500 GT OR OVER.
WHAT YOU KNOW ABOUT IT : IT IS TO PROVIDE AN INTERNATIONAL STANDARD FOR THE SAFETY
MANAGEMENT AND OPERATION OF SHIPS AND FOR POLLUTION PREVENTION. TO ENSURE SAFETY AT
SEA, PREVENTION OF HUMAN INJURY OR LOSS OF LIFE, AND AVOIDANCE OF DAMAGE TO THE
ENVIRONMENT AND TO PROPERTY.
IS IT GOOD FOR OOW: YES, BECAUSE IT PROVIDES FOR SAFE PRACTICES IN SHIPS OPERATION AND SAFE
WORKING ENVIRONMENT.