Zonker,
Since you make no mention of
what your "plan" is,
where/how long you'll be executing your "plan", nor
what/how your
internet access will be used, it is difficult for anyone to give you specific
advice....although I assume that KVH, SeaTel, INMARSAT, etc. (and
Furuno, Sailor, etc.) have already done so...(but, if that were the case, would you be here inquiring???)
Ah, yes....it is the weekend (so you cannot get specifics from the sales reps until tomorrow), and you're mind is whirling with all the "stuff" that they've given you....
Whatever the case...you're here asking some specific questions...and I can offer you answers....
So, here goes....
1) I'm very familar with mini-VSAT systems / the KVH V3 and V7 (and their new V11), as well as other VSAT systems and INMARSAT FleetBroadband systems....
(but, I have no experience with a "Vx" system, technology changes rapidly and perhaps me being occupied with
family matters has kept me from keeping up-to-date???)
2) With any of these systems there ARE limitations (see below), and the monthly costs prevent all but the very serious business users,
offshore researchers, etc. from even considering these as their primary internet access....
Since there are wide variations in users, it's difficult to pin down exact
numbers, but the range for even the smaller users is from $1000 to $2000 per month!!!
Figure on about $1 / Mb of data used, per month, plus monthly
fees,
equipment amoritization, etc....
{FYI, I'm not a big data user, and neither are my friends....but a good friend of mine just got a new
iPhone and data plan....and coincidencely just yesterday told me that he's used almost 30% of his "free" data for an entire month in just one week....
Specifically, he used just under 600Mb in one week, and he's not a big data user.....(if he was suing a mini-VSAT terminal, his month data costs would be about $2400 / month!!!)....and that's on an
iPhone....
I shudder to think how much data the average small business user passes thru in a month.....
And, I've personally heard from Fleet Braodband users (and other
satellite data users) who've found monthly bills of > $5000 / month....
Just something for you to understand and think about...}
3) Understand that most VSAT systems (such as the KVH V3 and V7) are Ku-band systems, and DO require an absolute clear line-of-sight to the
satellite to be maintained at all times.....that means no shadows/blank zones from masts, booms, superstructure, awnings, etc....
AND, just like a DirecTV / DISH
Network satellite signal, they will also suffer from rain / precipitation outages (which can be worse at sea, since the 3-axis stabilization is more difficult when the
weather is bad....and as such, the
antenna will not be as precisely positioned as when in calm seas....)
Generally, the bigger the dish/antenna the better the system works (the more
reliable it is)....due to both, higher C/N (lower bit-error rates), AND higher link
budget margins (allowing operation in rain, etc.)
4) You ask about the
reliability of VSAT and INMARSAT systems (which are very reliable) and also include wi-fi in your mix???
So, I'm wondering what your application is....as those looking at VSAT systems (not cruising boats) are not the users of coastal wi-fi (most cruising boats)????
Quote:
Originally Posted by Zonker
To make my plan come true I need a very reliable internet access everywhere. Seems even in coastal area Wifi is just not that reliable as on land.
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But, again you ask some specifics, so I'll do what I can....
5) To your specific queries....
Quote:
Originally Posted by Zonker
So my decision is to get a TracPhone V3. Since this piece is quite expensive (16k ?!) I need to know how reliable that precious thing works.
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a) It works very well, and does what it is designed to do....it is a very basic/entry-level VSAT terminal....
b) Understand the limitations of all Ku-band VSAT systems (see above), and the limited coverage using the Ku-band systems (not worldwide!!!)
c) There should be detailed coverage maps available from any vendor /
service provider / manufacturer......but, in general, expect coverage across the N. Atl.
Med, much of the N.
Indian Ocean and much of the N.
Pacific Ocean......and only coastal waters off S. Amer.,
Africa, etc....but no coverage in S. Pac, S. Atl, nor S. Indian Oceans....
d) Do NOT forget the
installation costs!!!! They will not be minor!!!
Quote:
Originally Posted by Zonker
My concerns are :
- how reliable can it hold a fix
- how reliable is it built (mean time between failures ?)
- how often is the service not available
- do you think a backup is necessary ? for ex. Inmarsat ?
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e) You can beleive the specs in regard to pitch/roll/yaw correcting, so as long as your vessel moves within those specs (and you're not in a rain
shower AND you are in an area of coverage), it will hold a fix on the satellite.....
f) I don't have the MTBF data off the top of my
head, but you can get that from KVH, etc....but, as long as it is properly installed (VERY important), in my opinion, you can expect years of reliable service...
g) How often service is "un-available", depends on
how often you're outside the coverage areas.....
h) A back-up wouldn't usually be necesary from the
equipment reliability point-of-view....but, if you do require coverage in areas that the VSAT systems do not cover, then a
Iridium Pilot (OpenPort) or INMARSAT Fleet Braodband would be required....
6) Upgrading ($$$$$) to a C-band/Ku-band VSAT system (such as the KVH V11) will allow you almost complete worlwide/global coverage (excluding areas above 70* - 75* latitude)......and the use of C-band will remove the "rain outage" issue of Ku-band systems....
BUT,unless you've got a serious mega-yacht, this is WAY over the top...these are VERY pricey (and Big and Heavy).....and I can't imagine anyone here on Cruiser's Forum even considering these....
7) INMARSAT Fleet
Broadband and/or
Iridium OpenPort / Pilot, services and equipemnt are both L-band systems, with NO rain-outage issues, and much less sensitive
antenna pointing requirements, etc....(the Iridium OP / Pilot uses non-directional phased antennas, thru their Low-Earth-Orbiting satellites)
And, as such both are much more
reliable for
offshore operations and both offer worldwide/global coverage (excepting areas above 70* - 75* latitude, for INMARSAT systems)....
With Fleet Broadand's rate increases, Iridium Pilot (aka Open Port) is now becoming the more economical of the two....albeit, Fleet
Broadband can offer faster speeds with their FB250 and FB500 systems....Iridium Pilot's speed is comparable to FB150....
[FYI, every few months someone posts questions similar to yours.....and most times they find the truth isn't what the want to hear/read.....so, please understand that you will not be alone in your reaction here!!!
Hey, what's that old saying....
"There's what people want to hear, what they want to believe, 'everything else' and then the 'truth'...." ]
I do hope this answers your questions....
Fair winds...
John
s/v Annie Laurie