What is sea area A1 A2 A3?
What is sea area A1 A2 A3?
sea area A1: within range of shore-based VHF DSC coast station (40 nautical miles) sea area A2: within range of shore-based MF DSC coast station (40 to 150 nautical miles) sea area A3: within the coverage of an Inmarsat geostationary satellite (approximately 70°N to 70°S, excluding sea areas A1 and A2)
What is sea area A3?
Sea Area A3—An area, excluding sea areas A1 and A2, within the coverage of an Inmarsat geostationary satellite. This area lies between about latitude 76 Degrees North and South, but excludes A1 and/or A2 designated areas.
Where is sea area A1?
The Coast Guard defines Sea Area A1 as those areas where more than ninety percent of the area within 20 nautical miles seaward of the territorial baseline along the East, West and Gulf Coasts of the United States, excluding Alaska, and including Hawaii, Puerto Rico, Guam, the Virgin Islands of the United States and the …
What are the 4 sea areas of GMDSS?
The GMDSS operates over 4 sea areas of coverage from shore to ship. The 4 sea areas are classified as: A1, A2, A3 and A4. Sea area A1: Covered by VHF radio enabling Digital Selective Calling (DSC) and Radio Telephone (RT). Determined range of approximately 20-30 nautical miles.
What is sea area a 1 under GMDSS?
Sea Area A1: This area is within coverage of VHF coast stations where digital selective calling alert (DSC) is available (CH. 70/156.525 MHz) so you must use VHF capable transceivers with DSC capabilities.
What are the 3 elements of GMDSS?
The different elements of GMDSS are as follows: It provides telex, telephone and data transfer services between ship-to-ship, ship to shore, and shore to ship along with a priority telex and telephone service connected to shore rescue centres.
What is the sea area description of A2?
Sea area A2 is that sea area which is within a circle of radius B nautical miles over which the propagation path lies substantially over water and which is not part of any sea area A1, the centre of the circle being the position of the coast station receiving antenna.
What is defined as an area excluding sea areas A1 and A2 within the coverage of an Inmarsat geostationary satellite in which continuous alerting is available?
(3) Sea area A3. An area, excluding sea areas A1 and A2, within the coverage of an INMARSAT geostationary satellite in which continuous alerting is available. (4) Sea area A4.
What equipment is in sea Area 3?
Sea Area A3: Here a complete VHF radio and either a MF/HF radio or INMARSAT station is required. This area covers 70-degrees North Latitude and 70-degrees South Latitude.
What is the GMDSS equipment on A4 Area 4 )?
GMDSS and its Uses
| AREA | RANGE | EQUIPMENT |
|---|---|---|
| A1 | 20 to 50 M | VHF DSC |
| A2 | 50 to 400 M | VHF + MF |
| A3 | 70° N to 70° S | VHF + MF + One INMARSAT |
| A4 | Above 70° N or S | HF + MF + VHF |
What is the GMDSS equipment on A3?
What is a sea area A1?
Sea area A1 is that sea area which is within a circle of radius A nautical miles over which the radio propagation path lies substantially over water. The radius A is equal to the transmission distance between a ship’s VHF antenna at a height of 4 m above sea level and the antenna of the VHF coast station which lies at the centre of the circle.
How far offshore is Sea area A3?
This area typically extends up to 180 nautical miles (330 km) offshore during daylight hours and 150 nautical miles (280 km) offshore during night time hours. Sea Area A3:
What is GMDSS sea area A1?
GMDSS Sea Areas: Sea Area A1: This area is within coverage of VHF coast stations where digital selective calling alert (DSC) is available (CH. 70/156.525 MHz) so you must use VHF capable transceivers with DSC capabilities. Typically, this area could extend 30 to 40 nautical miles (56 to 74 km) from a coastal radio station. Sea Area A2:
What do I need for Sea area A3?
Sea Area A3: Excluding Sea Areas A1 & A2, this area is within coverage of INMARSAT geostationary satellites. Here a complete VHF radio and either a MF/HF radio or INMARSAT station is required. This area covers 70-degrees North Latitude and 70-degrees South Latitude.
