I remain a sceptic that this is urban myth spread probably by the GPS suppliers to encoruage people to buy standalones.
The OP clearly stated he wanted it as a second bit of kit.
I know several WAFIs who use Hudls etc on board for this purpose. The only person I've ever met who had an issue had a steel boat with a steel cabin. He expected issues!
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Originally Posted by neil.mccrirrick
The chip in the phone is a low power option due to the phone battery having several other things to manage.
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So when I got my first GPS it ran on 4 x AA Batteries at 600mAh and 1.2V - giving a maximum power of 2.88Wh. My phone has a 3200mAh 7.2V battery and yes it does other things but can provide 23Wh of power. Nearly 10 times more..? But even more importantly it doesn't need to transmit anything, just process it so other than perhaps some amplification I'm not sure why more power is needed? A typical GPS Chip draw 50mW. If you want to save power you don't process the data as often. So my anrdoid will reduce power consumption by reducing from 1second fixes to 10second if power goes below 30%. On a boat wired into the battery this wouldn't be an issue.
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Originally Posted by neil.mccrirrick
Getting a fix going to airplane mode and doing a test is not the same as being out of coverage and doing a "cold start". You could easily find it takes 20 mins or more to get a fix. Plus the aerial isn't dedicated so there is another problem
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So for the sake of science. If I go to airplane mode, drive 20 miles, switch on GPS but no cell usage and time how long it takes for first fix on a bobbing boat would that satisfy you?
Why is he doing a cold start anyway? It will be on as he leaves the marina.
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I can't find compelling evidence that says you can rely on a phone gps so it's out.
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What evidence do you want that you can provide for any plotter?
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Whole set up if you already have a tablet is cheap circa £2-300 for plotter sounder combo but unproven
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I can buy a suitable tablet for under £50, Mount for £20, Charger £5, Navionics £25, or I think OpenCPN have an android work around. Without adding rubber and such you can do this for under £100 these days. Not bad for a second plotter in a dry cabin. Waterproofing however is a different league of challenge
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Originally Posted by neil.mccrirrick
There is pedantic and then unhelpful. We all know relying on anything electrical at sea carries risk. Taking something that you have no idea will work is too high risk for me if it's the only option you have. Did I not make that clear
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Nope - because you would surely validate the set up before taking it anywhere where you might "want to rely on it"? And you will presumably have built in redundancy of second plotter, phone with functions, erm... a paper chart, mark 1 eyeball!
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I posted to help with the research I had done. I'm no expert don't pretend to be so any quote of what I have said to illicit a response is largely pointless tbh
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But you did make out you know what you are talking about but haven't backed any of it with any evidence that it is true and current to modern tech. You said things like "same aerial" which is wrong. You said the phone can't spare the battery power which I think is not the same as phone cant get a fix in the same place with the same accuracy. You implied you know more than you've been prepared to evidence...
Fandango
