Fishing from a boat...

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Fishing from a boat...
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Nick

Joined: 02 Nov 2004
Posts: 34535
Location: Hereford

Posted: Wed Apr 23, 08 12:10 pm Post subject:
And, are sure they can't find you with a mobile phone? Certainly mine is used to locate me several times a week. Perhaps it's a resolution thing, so it might not be precise enough. (Anyone curious, on Vodaphone, can dial 2222, and hit option 3).

RichardW

Joined: 24 Aug 2006
Posts: 8443
Location: Llyn Peninsular North Wales

Posted: Wed Apr 23, 08 12:24 pm Post subject:
I think that works ok in l;arge towns with more base stations so they can see how many your signal can be picked up on then using the overlaping base station areas work our roughly where you are. I guess at see you will be on one or two at most. Could be a large area. Justme

gnome

Joined: 19 Apr 2006
Posts: 730

Posted: Tue May 13, 08 10:00 am Post subject:

i wouldnt risk my life on a mobile - for one thing, most oceans don't have masts every couple of miles, so you can't guarantee a signal (your nearest mast is probably on land - so make sure you are in range) there is nothing intrinsic to a basic mobile that enables them to pinpoint where it is. i think it can be done if you are within range of two masts and they can triangulate a position - not sure on that. being within sight of the harbour is no measure of safety - a great many people drown within sight of a harbour. unless you are close enough to it to safely swim to the steps wearing soaking wet clothing and boots, and against the tide in stormy weather.

happytechie

Joined: 24 Jan 2006
Posts: 408
Location: Surrey (at the mo.)

Posted: Mon Jun 09, 08 7:15 pm Post subject:

Nick wrote:

And, are sure they can't find you with a mobile phone? Certainly mine is used to locate me several times a week. Perhaps it's a resolution thing, so it might not be precise enough. (Anyone curious, on Vodaphone, can dial 2222, and hit option 3).

Not to my knowledge. The Coast Guard can DF a VHF signal very accurately using multiple aerials. They just press some buttons while you are transmitting and then tell the lifeboat where you are (or were when transmitting).

Mobile positioning will tell you which cellphone mast you are using. In a city this is likely to be quite a small area but out at sea it would only be the nearest bit of land to you. In a rural area (like anglesey) this could put you anywhere within a big circle and in the launch area for 2 or 3 different lifeboats.

RichardW

Joined: 24 Aug 2006
Posts: 8443
Location: Llyn Peninsular North Wales

Posted: Mon Jun 09, 08 7:35 pm Post subject:
We tried a service that located you via the mobile phone in the Gwynedd area. The best it could do was a 6 mile radius if near Pwllheli or a 15 mile one if outside of the Pwllheli one. Not much help on land would be worse at sea. Justme

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