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Go Back   SailNet Community > On Board > Gear & Maintenance > Electronics > ipads or tablets with built in GPS
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Thread: ipads or tablets with built in GPS Reply to Thread
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Topic Review (Newest First)
08-20-2014 02:57 PM
goboatingnow
Re: ipads or tablets with built in GPS

Quote:
Originally Posted by aa3jy View Post
There is some confusion as what type of GPS chip is in iPads/iPhones as I was. Technically they are built in Assisted GPS (aGPS)not Stand alone GPS (sGPS)chips being 'assisted' by either WiFi or Cellular to access internet maps.

Assisted GPS - Wikipedia, the free encyclopedia

Now my understanding with pre-loaded maps such as iNAVx there no need for 'assistance' to access on-line map data such as Google maps.

But I'm not sure if the current generation iPad/iPhone has the capability to fall back to autonomous mode when there is no (WiFi/Cellular)internet connectivity...such as being off shore.
A-GPS, means that the system can download ephermis data from a cell network at much higher speeds then from the GPS sat network. ( 12 - 15 minutes) this greatly increases TTFX ( Time to first fix). Equally some towers etc can provide location information as well as using RSSI information to triangulate Wifi hotspots etc.

But If the "Assisted" isn't available , then the GPS works like any other standalone GPS system quite happily

IN that regard A-GPS are better then GPS, not the other way round.

ANY APPLE WITH a GPS CHIP, works independently of any other communications system.
08-20-2014 09:04 AM
MikeOReilly
Re: ipads or tablets with built in GPS

3rd generation iPad with GPS here using iNavx and navionics charts. Works just as well as my handheld Garmin, completely independent of wifi or cell. Sometimes I see a message suggesting I turn on wifi and cell data, but it picks up a GPS signal just fine without.


Why go fast, when you can go slow
08-20-2014 09:02 AM
Minnewaska
Re: ipads or tablets with built in GPS

Goodness, will the misinformation never end.

Assisted has nothing to do with online access to maps. There are dozens of GPS satellites around the globe and any gps needs to recognize a certain number of them to operate reliably. When started, they begin to search for which are nearby, as the device has no idea where it is. With "assistance" it already knows its in Europe or North America, for example, and begins to look first for those that it should find. This just speeds up the start up process, but has nothing whatsoever to do with performance thereafter. Some gps units will store their last known position to start looking there first. Some chartplotter antennas actually do this. You may not even be aware that your antenna has a little watch battery and processor inside for this purpose.

Whether access is needed to wifi or cell to get a map, is strictly a matter of how the app you are using was written. Has nothing to do with the GPS receiver.
08-20-2014 08:03 AM
aa3jy
Re: ipads or tablets with built in GPS

There is some confusion as what type of GPS chip is in iPads/iPhones as I was. Technically they are built in Assisted GPS (aGPS)not Stand alone GPS (sGPS)chips being 'assisted' by either WiFi or Cellular to access internet maps.

Assisted GPS - Wikipedia, the free encyclopedia

Now my understanding with pre-loaded maps such as iNAVx there no need for 'assistance' to access on-line map data such as Google maps.

But I'm not sure if the current generation iPad/iPhone has the capability to fall back to autonomous mode when there is no (WiFi/Cellular)internet connectivity...such as being off shore.
08-20-2014 07:48 AM
T37Chef
Re: ipads or tablets with built in GPS

Quote:
Originally Posted by Minnewaska View Post
I'm not familiar, but no app is going to create a gps receiver. If you Tab 3 has a gps receiver, the app is just making use of it.

However, old school early road navigation apps would not actually use gps, but would rather triangulate cell tower signals. If that's what your geek friend is suggesting, its not at all the same accuracy as gps. The software would first do the very rough calcs and then look for what road is nearby where it thinks you are. When this tech first came out, it was fascinating that a phone could put you in the right neighborhood, but they were not nearly accurate enough to be useful.
I think its the first thing you mention...the "geek" was a Best Buy of Office Depot associate iircc
08-20-2014 06:54 AM
Minnewaska
Re: ipads or tablets with built in GPS

For what it's worth, I'm still an apple user. iPhone and iPad. I like the combo, because apps transfer across the two for free, some even update each other for things I've saved. For example, my Charts and Tides app is on both.

For my past cruise, I decided to get the LifeProof case for my phone and almost always kept it in my pocket. The screen is seriously disadvantaged by size, to be useful for serious nav. However, when I was interested in how many more mile to my destination and/or alternative (I did duck a thunderstorm by beating it to an alt anchorage last week), its just a couple of easy taps on the screen. The live weather radar app was invaluable too. Never got up from the helm. Lifeproof case is fully waterproof and barely bigger than the phone itself.
08-20-2014 06:49 AM
Minnewaska
Re: ipads or tablets with built in GPS

Quote:
Originally Posted by T37Chef View Post
A geek told me I could dowload an app for a Samsung Tab 3...that makes it gps capable?......
I'm not familiar, but no app is going to create a gps receiver. If you Tab 3 has a gps receiver, the app is just making use of it.

However, old school early road navigation apps would not actually use gps, but would rather triangulate cell tower signals. If that's what your geek friend is suggesting, its not at all the same accuracy as gps. The software would first do the very rough calcs and then look for what road is nearby where it thinks you are. When this tech first came out, it was fascinating that a phone could put you in the right neighborhood, but they were not nearly accurate enough to be useful.
08-19-2014 10:42 PM
T37Chef
Re: ipads or tablets with built in GPS

A geek told me I could dowload an app for a Samsung Tab 3...that makes it gps capable? I must try this! On our vacation sail North I found I used the Navionics on my phone more than the iPad (generously loaned to me by chef2sail).

I have now have a chartplotter and found the phone apps on my Samsung Galaxy S5 Active easier to use than a laptop or tablet/iPad...each their own.

The Marine Traffic app along with the mAIS app by Marine Traffic was great as well...search our boat and when I activated the AIS app...folks could track us...pretty cool.

Now I'm causing thread drift...surprise! ;-)
08-19-2014 08:20 PM
MarkofSeaLife
Re: ipads or tablets with built in GPS

If I had Photoshopped the GPS screen I would have photoshopped in a better boat speed
08-19-2014 08:14 PM
MarkofSeaLife
Re: ipads or tablets with built in GPS

If iPad doesn't have GPS how did I get these two shots...

Or am I part of an Apple conspiracy? Damn it! You found me out! Elvis is the helmsman (mind you he is gettin a bit old even for that.)
BTW the chart one you are looking for the green dot under "Atlantic Ocean"... ummm but not under the ocean, if ya know what I mean
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