Cruise communications 2014
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Transcript of Cruise communications 2014
Cruise Communications
Marius Coomans
The Way We Were
Here and Now…
Marine Communication
• Radio Communication• Antennas• Emergencies• Automatic Identification (AIS)• Satellite Phones
Online Communication
• Internet Access• Managing Telstra• Position reporting with Skipr.net
• Online Applications
The Radio
VHF v HF
Fixed and Mobile
Antennas
Antennas
Antennas
Antennas
Typical whip antenna radiation pattern
The higher the gain, the narrower the beam
The effect of heel on transmission
Distance to Horizon
Yacht A (10 m) - 11.3km (6 NM)
Yacht B (20m) - 16 km (8.6 NM)
Tower (100m) - 35.7 km (19.3 NM)
Repeaters (ch 20-22 , 80-82)
Antennas
• Antennas are matched to a Frequency (band)
• What matters is Power Delivered rather than transmitter power
• VHF and higher bands operate on the basis of "line of sight“
• The gain and radiation pattern of an antenna are critical.
Emergency Communications
Mayday CallMayday, Mayday, Mayday, this is Boatname, Boatname, Boatname. [break]
Mayday, this is Boatname, we are taking on water and are about to abandon ship.
Our position is: 31 degrees, 23 decimal 45 minutes South, 152 degrees, 15decimal 67 minutes East.
We have two people on board.
Mayday?
Mayday?
AIS instruments
Satellite Phones
• Inmarsat• Iridium• Globalstar
Inmarsat
Geo Stationary Orbit
Iridium
Low Earth Orbit
Globalstar
Low Earth Orbit
Selecting a Satphone
• Rent or Buy• Emergency or Routine Comms
• Voice, Data and/or Text• Coverage• Price
Satellite Communicationsmore than mere phones…
Online Communication
• Mobile Internet• Position reporting with Skipr• Online Applications
+ Familiar, flexible, no commitment
- Poor battery life, limited coverage
+ Economical, flexible, multi-user
- Another battery, another plan
+ Best coverage, set & forget, always on
- Requires installation, another plan
850 MHz v 2100 MHz
Number of Phone Towers
Permanent Antenna
Internet in a Sock
Telstra Pre-paid Data
Telstra Pre-paid Data 2011
Telstra Pre-paid Data 2014
Telstra Pre-paid Data
Gigabyte 2011 20141 $40 -30 days $15 - 10 days4 $80 - 60 days $50 - 60 days
10 $150 - 365 days $100 - 90 days12 $200 - 365 days
Skipr.net
Online Applications
On the Internet, nobody knows you’re “away”.
Online Communication
• Internet Access Alternatives• Managing Telstra• Position reporting with Skipr
Cruise Communication Links
Credits, further reading:
Rob’s Passage Planner – http://skipr.net/goodies/robs-passage-planner/Skipr.net - http://skipr.net/Telstra references – downloaded March 2011 - http://telstra.com.au/VHF Marina Antenna Fundamentals - http://boat-project.com/tutorials/vhfant.htmWikipedia on AIS - http://en.wikipedia.org/wiki/Automatic_Identification_SystemIridium Go https://www.iridium.com/products/Iridium-GO.aspx?section=support
Also see handout.
Marius Coomans – [email protected]