Performance Standards of ARPA :

-

  1. Manual and/or Automatic acquisition for relative speeds up to 100 Kts. However manual acquisition must be possible.
  2. Track, Process, Simultaneously display and continuously update the information on at least 20 targets, whether automatically or manually acquired.
  3. Display on request with relevant symbols at least 4 equally time spaced past positions of any target being tracked over a period appropriate in the range scale in use.
  4. Should be available on  3, 6 & 12 nm Range scales.
  5. Present in not more than 1 min - an indication of targets motion and within 3 min - targets predicted motion.
  6. After changing range scales, full target information should be displayed within a period of time not exceeding 1 scan.
  7. Should be capable of giving Audible and Visual Alarms.
  8. The following data for each selected target should be provided,
    • Range
    • Bearing
    • CPA
    • TCPA
    • True Course
    • True Speed of the Target
  9. Should be provided with trial manoeuvre feature.
  10. Should not degrade the performance of any equipment providing sensor inputs, also should not degrade the performance of that equipment.
  11. Test program should be available so that the overall performance of APRA can be assessed.
  12. Should be capable of Sea Stabilization.              


                                     

Comments

Post a Comment

Popular posts from this blog

Action to be taken in case of GPS Failure :-

-
Inform Master. Switch over to GPS 2 (If fitted & working). Note down the last position obtained from GPS. Obtain the position of the vessel from Celestial or Terrestrial means . Increase the frequency of position fixing. Plot the position of the vessel in ECDIS. Inform VTS / Port Authority & Company Agent. Monitor the position of vessels in vicinity. Navigate the ship clear from any proximity to navigational hazard. Try to rectify the GPS by referring the GPS Manufacturers Manual. Keep a record of all events. Effect of GPS Failure:  ECDIS gives mandatory alarm & automatically switches over to DR mode.  Radar and ARPA switches to Relative motion. There are chances that Gyro may give an alarm, Since Gyro has latitude error and which needs GPS Sensor to correct the same. AIS will not transmit position of the vessel.
Read more

Action to be taken in case of RADAR Failure :-

-
      Single RADAR Failure (X Band or S Band)   : Inform Master. Firstly, Navigate the vessel safely with the other RADAR(If fitted). Reduce speed if appropriate. Try to identify the cause for RADAR Failure by Troubleshooting as per Manufacturer Manual. Inform VTS / Port Authority & Company Agent. Keep a record of all events. Both RADAR Failure (X Band & S Band) :  Inform Master. Reduce Speed of the vessel. Post extra lookouts. Do manual plotting by obtaining Bearing and Range of the target vessels from AIS. Monitor the position of the vessels in vicinity. Monitor the proximity to any danger to Navigation. Inform VTS / Port Authority & Company agent. DO NOT SWITCH ON NUC LIGHTS / SHAPES Pass at a safe distance from all Navigational Hazards by using PI (Parallel Indexing) in ECDIS. Broadcast SAFETY Message in VHF CH70(Alert) & CH 16. Also check our Topics: Action to be taken when MOB in TSS. Action in case of GPS Failure. Action in case of...
Read more

Action to be taken when MOB in TSS:-

-
Actions are to be taken in the following sequence: Release the MOB Marker on the same side (lifebuoy with light and smoke signal) Hard over Rudder to the side of MOB  Press MOB button in GPS & ECDIS Inform Master (usually Master will be on the bridge when vessel is in TSS) Post extra lookouts and guide them to identify the person/MOB marker Sound 'O' on ships whistle (3 Prolonged blast) & hail " MAN OVERBOARD " Raise flag " Oscar " Inform VTS / Port Authority Inform E ngine R oom & Anchor party DO NOT PERFORM RECOVERY TURN IN TSS , ONLY TO BE DONE WHEN AUTHORISED BY TSS. Broadcast URGENCY message in VHF ( Later can be upgraded to DISTRESS if unable to start rescue immediately) Manoeuvre the vessel to ITZ or Separation zone for Anchoring Press VDR Backup button (if appropriate) Maintain watch on VHF CH16 (or Designated by VTS / SAR Authority) If VTS permits the vessel to commence Rescue, Rescue boat team must be mustered well in advance and p...
Read more