SHIP'S BRIDGE EQUIPMENT - GPS
( GPS ) GLOBAL POSITIONING SYSTEM
(GPS) GLOBAL POSITIONING SYSTEM
GLOBAL POSITIONING SYSTEM ( GPS ) :
The word "GPS" stands for GLOBAL POSITIONING SYSTEM . The requirement and use of this equipment on board merchant ships is governed by the CHAPTER V , REGULATION 19 of SOLAS CONVENTION .
GPS is a navigation system based on the several satellites. The user side receiver , gives the continuous updates about the user's position on the earth ( in Latitude and Longitude ) at any given moment. The accuracy of this position is about 5 meters.
SPECIFICATION & CONSTRUCTION :
GPS receiver is a box shaped instrument placed on the ship's bridge . (Now a days various types of portable GPS receivers are available in the market and they are used in most private cars etc )
This instrument on ships has various display modes and feed types to be advantageous to the users.Some of these display modes and feed types are as under :
- BRIDGE DISPLAY
- "X" TRACK DISPLAY
- WAY POINT FEED
- "X" TRACK ALARM FEED
- MAN OVERBOARD ALARM MARKER
The GPS system consists of 24 orbital satellites in 6 different paths.The system works on doppler shift techniques. The GPS signals are comprised of various components such as :
- Ephemeris data
- Almanac data
- Pseudo random code
This Pseudo random code identifies the satellite because every satellite has its unique code. The Ephemeris data is continuously transmitted by the satellites and it contains very vital information such as date , time , status of the satellite etc. The Almanac data conveys the receiver the position of each satellite at any given time in a day.
In short, Every satellite of this system transmits messages to the all other satellites of the system , such as my name is satellite Alfa , my position is Bravo and time of sending this message is Charlie.The user side GPS receiver receives the data and based on that fixes the position.
PRODUCTS FROM AMAZON
FROM THE EDITOR'S DESK :
I have put in all my efforts to provide the details of the marine instrument called GPS "GLOBAL POSITIONING SYSTEM" in very simplified language.
Also, I have endeavored to put in the details of the usage of this instruments on board a ship along with its specifications and installation requirements.
I hope this information will be of great importance to the visitors, particularly to the marine personnel's and nautical students.
You are kindly requested to pass your suggesations and comments directly to me.
Thanks & Regards