IPhone GPS

Navionics

Get a Lowrance HDS or Elite series GPS and put satellite maps .. Accurate and don't have to be playing with your phone while driving

quote:

---

Has anyone purchased a GPS app for the Iphone that works in the marsh around Hopedale? I was told there are a few that you can purchase that will work in airplane mode?

---

lol, you heard wrong.

By the way phones do not have GPS and will not work as GPS without cell signal. AGPS and GPS are not nearly the same thing. AGPS is a hybred and requires cell signal, go buy a GPS if you are going to be using it outside of good coverage areas.

That is incorrect.

I have a spare iPhone (no network connection) that I loaded the Navionics app on that I use exclusively for fishing, as a backup gps.

You are wrong. I just checked this by turning my phone on airplane mode before walking to the stand. Google maps followed my location the whole time.

This also works for gps golf apps as I have an old phone with no connection that I use as a range finder.

quote:

---

You are wrong. I just checked this by turning my phone on airplane mode before walking to the stand. Google maps followed my location the whole time.
This also works for gps golf apps as I have an old phone with no connection that I use as a range finder.

---

quote:

---

You are wrong. I just checked this by turning my phone on airplane mode before walking to the stand. Google maps followed my location the whole time.

---

On an Iphone? I highly doubt this unless your phone is malfunctioning, unless something has recently changed airplane mode disables the AGPS by design on Iphones.

Android on the otherhand does not disable AGPS with airplane nmode

quote:

---

This also works for gps golf apps as I have an old phone with no connection that I use as a range finder

---

you are confusing "connection" with service. Every phone in range has a connection, whether the towers owner gives you access to service is a different matter.

It is a FCC requirement that a connection is enabled on all mobile devices at all times (unless disabled by user) whether service is paid for or not to allow e911 calls. Your device communicates with the nearest tower regardless of service contracts.

quote:

---

By the way phones do not have GPS and will not work as GPS without cell signal. AGPS and GPS are not nearly the same thing. AGPS is a hybred and requires cell signal, go buy a GPS if you are going to be using it outside of good coverage areas.

---

You don't know what you're talking about

quote:

---

Mississippi State fan

---

Oh...

I had my iPhone on airplane mode and Navionics plotter our route in Venice 14 miles offshore. No clue how it did it, but it was our exact route. I'm thinking gps still works with airplane mode

quote:

---

On an Iphone? I highly doubt this unless your phone is malfunctioning, unless something has recently changed airplane mode disables the AGPS by design on Iphones.

---

Iphone has both a GPS receiver and an AGPS receiver. This goes as far back as the iPhone 3G. Location service on the iPhone combines 3 completely separate technologies. GPS, cell tower triangulation, and Wifi-based location. I don't know the algorithm they use, but I think that they use whatever service is currently providing the most accurate location information.

I'm not familiar with the current iphone but I know the previous versions did not have WAAS capability. The GPS receiver works by measuring how long it takes for the radio signals to propagate between satellites and the receiver. The propagation time varies based on the density of the atmosphere between each satellite and the receiver, in this case a cell phone. Because the density fluctuates, a regular GPS receiver can only get a fix that is accurate to about 25 or 30 feet. Some geostationary satellites transmit the atmospheric density information that lets GPS receivers compensate for current atmospheric conditions, this will get the accuracy down to a couple of feet or less.

A little googling tells me the iPhone 4S and 5 support GLONASS, which provides near-WAAS accuracy when combined with standard GPS.

tldr; You're wrong.

Google has save maps for offline use and so does a few other apps, so yes cave is wrong and it does work without cell signal.

Just look for apps that allow save for offline.