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  #11  
Old 03-06-2013
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Re: iPhone4 and iPad2 w/o 3G

The iPhone GPS isn't really accurate enough for "precision" navigation on it's own, it is most effective combined with other sources of input. You'd be better getting a receiver designed for your given purposes. I've had the receiver show me between 10-15 miles off my actual location before and take upwards of 30 minutes to get an initial fix.
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Old 03-06-2013
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Re: iPhone4 and iPad2 w/o 3G

I think your iphone is broken. Mine fixes quickly and resolves to within feet.
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Old 03-06-2013
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Re: iPhone4 and iPad2 w/o 3G

Quote:
I think your iphone is broken. Mine fixes quickly and resolves to within feet.
Second that. I just disabled WiFi and Cellular on my iPad3, rebooted and opened MotionX-GPS. The spinning globe went from red to blue in about 10 seconds.

There is no longer reduced accuracy for civilian use. Rather, DoD can enable Selective Availability (SA) in times of emergency. There are also military receivers not available for civilian use that allow very high altitude and speed positioning. In general GPS is GPS on the civilian side. So for the 3G iPad, the GPS is real. Some people think that what Apple calls "Assisted GPS" to be less than real GPS. The opposite is true, Apple uses combined Wi-Fi and 3G signals to assist GPS is areas of poor reception like in cities where the sky is obscured and multi-path abounds.
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Old 03-06-2013
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Re: iPhone4 and iPad2 w/o 3G

I have an iPad 3 with cellular. I have the Garmin app and down loaded their charts. The app is free but the charts cost. My iPad has GPS and worked beautifully all the way down through Florida and across to the Bahamas. The cellular connection also gives me full Active Captn information but as a GPS unit it works beautifully without cellular connection - great charts and great accuracy
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Old 03-06-2013
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Re: iPhone4 and iPad2 w/o 3G

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Originally Posted by Sabreman View Post
Some people think that what Apple calls "Assisted GPS" to be less than real GPS. The opposite is true, Apple uses combined Wi-Fi and 3G signals to assist GPS is areas of poor reception like in cities where the sky is obscured and multi-path abounds.
Assisted GPS works great in areas where that information is available, so on land and by using location data from other sources. When you get out of those areas, the accuracy and time to fix is significantly worse, especially when compared to an external GPS receiver.

When I've been in those situations, it's been hit or miss. The GPS receiver in the iPhone or iPad would work for a while, then go out completely with no fix at all, then show us on a fix that was within a 30 mile radius of our actual location. There were some situations where we'd never get a fix at all or only get an unreliable fix. Obviously based on signal quality or number of satellites acquired increased reliability, but those factors change on a regular basis with the built in GPS and stay more consistent with external receivers. The built in GPS receivers in those devices just isn't designed for the type of navigation that you'd want to use it for.

In other words, they work fine when you are driving down the road with cell and wifi location data. Away from all that, not so much. I've seen it be unreliable on multiple mobile devices, so it's not a singular device. I've seen it fail enough to justify spending the $125-some dollars on an external or fixed unit, YMMV.

OTOH I don't really trust the external units attached to a mobile phone either, I prefer dedicated devices. I'd consider using my phone for navigation a last resort for anything except driving down the road.

Last edited by Shinook; 03-06-2013 at 09:23 PM.
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Old 03-06-2013
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Re: iPhone4 and iPad2 w/o 3G

I think some of the people are saying their ipad gps works great for them even when the 3G and wifi are turned off. Just to clarify what they were saying.
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Old 03-06-2013
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Re: iPhone4 and iPad2 w/o 3G

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Originally Posted by strandedsooner View Post
I think some of the people are saying their ipad gps works great for them even when the 3G and wifi are turned off. Just to clarify what they were saying.
I'm aware.

It has not for me. If anything this should tell you that YMMV. I wouldn't trust it as a navigation source unless I've been to my destination and seen it work under multiple conditions, but I've personally seen it fail a number of times, enough to know I wouldn't rely on it unless I had to.

I'm also not confident that disabling 3G and wifi is a reliable test. I seem to remember reading somewhere that the devices cache location information when it's pulled, meaning the lack of 3G or wifi sources wouldn't impact the ability of the device to locate itself as it would begin the process using cached location data.
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Old 03-06-2013
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Re: iPhone4 and iPad2 w/o 3G

Any opinions out there about apps for an iPhone 4? I think I just downloaded Intellicast for Boaters, but I can't find it.??? What about a charting app?

I have redundant navigation gear and would only consider the iPhone for deep backup in a coastal setting where the cell coverage is generally acceptable.
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Re: iPhone4 and iPad2 w/o 3G

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Originally Posted by fallard View Post
Any opinions out there about apps for an iPhone 4? I think I just downloaded Intellicast for Boaters, but I can't find it.??? What about a charting app?

I have redundant navigation gear and would only consider the iPhone for deep backup in a coastal setting where the cell coverage is generally acceptable.
I had Jeppesen for a while but it was dog slow on my iPad1, I also thought the interface was not intuitive. I wouldn't recommend it, but you can try it for free iirc.

I should note that the first gen iPad is substantially slower than later generations, so performance may be better on other devices.
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Old 03-06-2013
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Re: iPhone4 and iPad2 w/o 3G

We have the Ipad II Cellular model but don't need the cell coverage for INavx as long as you download the charts before you depart. I have it loaded on my phone as well for redundancy and it's been awfully handy to pull it out when we're sitting away from the boat when we have a quick question about a route, etc. Their customer service is excellent as well. We also have Aye Tide to compliment INavx and Boating Suite for boat log/maintenance info. Love INavx and it's really intuitive and powerful. In our area (Puget Sound), you can activate the AIS and see (but not transmit...) other boats nearby, including the large behomoths!

Yes, we have all the paper charts, too...

Enjoy!
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