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Old 19 May 2016, 16:05   #11
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But more kit not designed to get wet on an open boat that gets wet...... All good then lol
Whisper has a cabin rib so a somewhat different prospect from a SR4.

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GPS on tablets is helped by phone signals as the gps on them is weak. And clearly at sea you lose signal
So as I understand it the cell signal helps (1) You download the almanac - only required on first turning it on (2) you get a position quicker (as you have an initial guess). Whilst at sea you MAY not have cell coverage (I suspect its not bad on the S. Coast), but you also are less likely to have buildings, etc to obscure the sat. signal.

I understand tablets are reasonably commonly used by yachties in their cabins?
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Old 19 May 2016, 18:28   #12
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So I've been thinking about this. GPS on tablets is helped by phone signals as the gps on them is weak. And clearly at sea you lose signal
What makes you say GPS on a phone/tablet is weak?

I thought they used the cell towers to get an approximate fix which meant they could get a quicker first fix with the sats as the phone already had an idea where it was.
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Old 20 May 2016, 12:51   #13
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They do and that's why they are quick, but once you lose the towers the gps to satellite signal is pants so you need to boost it or treat this as a backup. Unless you will always be in mobile phone coverage. Won't work for me as we cruise west coast of Scotland


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Old 20 May 2016, 13:13   #14
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iPad Plotter/AIS - Again

Ok, so if an external GPS is required will it connect to a Raymarine Wi-fish via wifi at the same time? Or is the wifi one device at a time?

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Old 20 May 2016, 13:17   #15
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The garmin connects by Bluetooth so your all good re the wifi. It will all work definitely 👍
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Old 20 May 2016, 13:18   #16
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Bluetooth the tablet to get gps to the plotter software. Wifi to the sounder and Bob is ur uncle
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Old 20 May 2016, 13:19   #17
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Old 20 May 2016, 13:28   #18
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Old 20 May 2016, 13:45   #19
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They do and that's why they are quick, but once you lose the towers the gps to satellite signal is pants so you need to boost it or treat this as a backup. Unless you will always be in mobile phone coverage. Won't work for me as we cruise west coast of Scotland


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Is it. Or is it positional? A fixed GPS has a horizontal antenna face. How is the phone or pad intended to be held when GPSing.

So on an open (but rolling) sea with no major sky obstructions ... im sorry unless you can point me to a reasonably scientifically run study I'm not convinced.

I have no major pad experience but plenty phone experience with sat pos and I would say in reasonably clear sky I will be showing 8-12 sats no problems, with flight mode enabled. 4 is usually enough for a 100m pos so 8 will get you to +/-15m easily. That's the size of a boat radius... 3m or less doable on calm sea
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Old 20 May 2016, 14:00   #20
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The chip in the phone is a low power option due to the phone battery having several other things to manage. 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

I can't find compelling evidence that says you can rely on a phone gps so it's out. Even using the garmin glo I would treat as back up with an old plotter I was going to upgrade while I tested it. Whole set up if you already have a tablet is cheap circa 2-300 for plotter sounder combo but unproven
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