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Post by Deleted on Mar 31, 2020 9:47:30 GMT
That makes sense. I must say I thought there was a type in between which did have a GPS but it was not a fully functioning one and required a network connection for the extra processing. Rather than just using the cell network to do as you say. So if it were connected then you will get a proper GPS if not you won't. Or something but I probably got it wrong. Things change. Maybe its how you say...
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Post by Deleted on Mar 31, 2020 9:49:30 GMT
I don't know. Assisted GPS? But that just seems to use a network connection to help out initially rather than actually requiring it for continued operation.
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Post by Telemachus on Mar 31, 2020 9:56:03 GMT
...some are wifi only, some have cellular data as well. Only the ones with built on cellular have gps. Is that peculiar to Apple products? I don’t know, but it sort of makes sense. If you have Wi-fi only you can’t use it “out and about”. If you have cellular, you can. No point in knowing where it is if it can’t get data for google maps etc over the internet.
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Post by Deleted on Mar 31, 2020 9:58:03 GMT
I don't know. Assisted GPS? But that just seems to use a network connection to help out initially rather than actually requiring it for continued operation. Different from something which doesn't work at all if there is no cell connectivity. Such a device would still have a GPS module that receives a satellite signal irrespective of any other system.
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Post by Telemachus on Mar 31, 2020 9:59:44 GMT
I don't know. Assisted GPS? But that just seems to use a network connection to help out initially rather than actually requiring it for continued operation. Apple products with GPS and cellular use “assisted gps”. When out in the open it uses pure gps. When in an urban environment where the gps signals may well be masked by buildings etc, it uses a combination of whatever gps it can get plus triangulation from Wi-fi sources. So the “assisted” bit is nothing to do with the quality of the on board gps chip, it is to do with making it work better when the satellite signals are blocked.
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Post by Deleted on Mar 31, 2020 10:00:01 GMT
There are loads of offline, device stored mapping applications including things like isailor.
So a GPS is very handy in a tablet which does not have a SIM card in it or WiFi switched on.
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Post by Telemachus on Mar 31, 2020 10:02:38 GMT
There are loads of offline, device stored mapping applications including things like isailor. So a GPS is very handy in a tablet which does not have a SIM card in it or WiFi switched on. Yes this is true, I have such an app for aviation. No cellular data above about 5000’. I was just trying to explain Apple’s logic.
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Post by Deleted on Mar 31, 2020 10:02:50 GMT
I don't know. Assisted GPS? But that just seems to use a network connection to help out initially rather than actually requiring it for continued operation. Apple products with GPS and cellular use “assisted gps”. When out in the open it uses pure gps. When in an urban environment where the gps signals may well be masked by buildings etc, it uses a combination of whatever gps it can get plus triangulation from Wi-fi sources. So the “assisted” bit is nothing to do with the quality of the on board gps chip, it is to do with making it work better when the satellite signals are blocked. A-Gps seems to be about the initial startup where internet connection provides additional data. en.wikipedia.org/wiki/Assisted_GPSETA I should have noted you are specifically referring to Apple products. Ok. I don't use them as find them a bit annoying but I know they are quite different to other systems.
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Post by Deleted on Mar 31, 2020 10:05:37 GMT
There are loads of offline, device stored mapping applications including things like isailor. So a GPS is very handy in a tablet which does not have a SIM card in it or WiFi switched on. sure is in the middle of the Atlantic...
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Post by Jim on Mar 31, 2020 10:05:42 GMT
How long do Ipads last - well, I'm just putting a 3 sim in one at least 10 yrs old, ipad 2, doesn't update anymore, but it's for my sister in law to join the modern world and keep in touch with friends and family while locked down.
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Post by Deleted on Mar 31, 2020 10:06:44 GMT
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Post by Deleted on Mar 31, 2020 10:07:50 GMT
...some are wifi only, some have cellular data as well. Only the ones with built on cellular have gps. Is that peculiar to Apple products? Yes
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Post by Telemachus on Mar 31, 2020 10:08:34 GMT
Apple products with GPS and cellular use “assisted gps”. When out in the open it uses pure gps. When in an urban environment where the gps signals may well be masked by buildings etc, it uses a combination of whatever gps it can get plus triangulation from Wi-fi sources. So the “assisted” bit is nothing to do with the quality of the on board gps chip, it is to do with making it work better when the satellite signals are blocked. A-Gps seems to be about the initial startup where internet connection provides additional data. en.wikipedia.org/wiki/Assisted_GPSETA I should have noted you are specifically referring to Apple products. Ok. I don't use them as find them a bit annoying but I know they are quite different to other systems. Assisted gps in the link you posted seem to be about cellular assistance, which we haven’t mentioned yet. But yes, triangulation from cellular as well as Wi-fi is used. Although when you live round here, being in range of one mast is lucky, 2 or 3 unlikely! The other thing to bear in mind is that all these devices have inertial reference platforms built in, so they know when they are being moved. There will be one big Kalman filter that merges all this data (pure gps, cellular triangulation, Wi-fi triangulation, inertial) to get an optimised position and velocity.
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Post by Deleted on Mar 31, 2020 10:10:05 GMT
Also, your 'wi-fi only' tablet can connect to the web via your phone, thus overcoming the problem. But it still wont work properly if the phone lacks the gps module...as the mountain rescue people will attest...
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Post by Deleted on Mar 31, 2020 10:11:15 GMT
I still think that some tablets have a GPS on them with full functionality whereas some have a GPS on them which requires network assistance. So for example crossing the channel there is a cell phone dead spot in the middle. The tablet with the real GPS would continue to provide position whereas the one with the network assisted GPS would be in danger of losing its position accuracy as it does not have the processing power to do everything on the device itself. Maybe wrong end of stick.. again
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