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mallo 03-21-2007 07:32 AM

Wifi
 
Hi all
I am new to this so excuse me if this is not the way to make a post.
I am interested in a way to connect my laptop to a WIfI area, I have heard of the Syrens onboard WIFI, is it any good, does anyone have any experience in using one and most importantly does it work.
Are their any other options?
Itís to be fitted to a steel sailing boat.
Best regards
Michael Allo

PBzeer 03-21-2007 08:56 AM

Your cruising grounds are a factor in getting internet on the boat. To pick up wifi, you're going to be somewhere near populated areas, most likely in cell phone range. If so, I think you would be more satisfied with wireless internet through a cell phone provider. Also, picking up a wifi signal is not just a matter of your end, but the transmitting end as well.

Idiens 03-21-2007 09:48 AM

I have only had success with WiFi in marinas, and even there, with line of sight to the transmitting antenna, I have experienced problems (multiple masts multipath I think). This year, I am trying a better and separate antenna at my end to see if it helps.

sailingdog 03-21-2007 10:09 AM

Mallo

The Syrens Wifi system is just a packaged marine antenna, bridge/router. It is a good way for them to make a good deal of money for not offering a whole lot. You could do just as well or better by getting a PCMCIA WiFi card with an external antenna jack and mounting an antenna on the boat... like a 90˚ 9dB gain planar antenna... and aiming it manually. The 90˚ coverage is the minimum you'd want, as the boat will swing a little. You could go with an omnidirectional, but the gain would be lower. The 200 mw PCMCIA cards are the ones you want to get for this type of use.

The advent of the 802.11n specification, which is not yet finalized, will improve range quite a bit. The pre-specfication gear for it is already out there, but as it is fairly new, unlikely to be deployed in many areas yet. It uses multiple radios, versus the single radio in the 802.11a/b/g standard equipment, to increase throughput and range significantly. The 802.11 pre-n gear is backwardsly compatible with 802.11b/g gear, but with no real benefits.

You do need to be near someplace with a broadband internet connection that has a WiFi access point for either of the setups to work...neither will do much for you on the open ocean or in remote anchorages.

The other option, as PBz has mentioned is connecting via a cellular telephone network. However, outside of the US, most of the cellular data plans are based on the data sent, not a flat monthly fee... so they can really add up. I've used T-mobile's cellular network for my internet connection when I was in the process of moving, and it's not all that bad.... faster than a dial-up modem, but slower than my current fiber optic connection.

The only reason a steel boat would affect any of this is if the antenna was down below, inside the boat... and it would basically punt... steel eats WiFi signal really nicely.

BTW, I've run a WiFi network at distances over a mile using 18dB gain parabolic grid antennas... but that was with two terrestrial, non-floating endpoints. The record for WiFi is somewhere over 40 miles IIRC.


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