iPAD App for offline maps and GPS positioning

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#21
Alberta, Canada
51 Posts
Joined Jun 2010
Originally posted by Kamloops50
In enhanced 911 system , GPS from the phone is the primary source of location. If the phone doesn't have GPS or turned off , they use triangulation from cell towers . Not all mobile devices have built in GPS. I have a pad and cellphone that don't have built in GPS.

Yes all phones are tracked when in use , more big government in place.

Can someone post a link to open source maps for map apps.

The Pocket Earth IOS App uses Open Street Maps as it's source of mapping data. The App downloads the maps of your choice automatically meaning you do not have to go to the website yourself.

Below is their webpage link. I am not sure how you would use it without an App or GPS device of some sort.

https://www.openstreetmap.org/#map=2/69.5/-117.1

Is this what you were asking for?


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#23
Ohio
308 Posts
Joined Nov 2010
I use Motion X GPS HD App for the iPad. You can download all the maps you need prior to leaving home.
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#24
United States
1,345 Posts
Joined Jul 2014
Originally posted by Kamloops50
Many cellphone GPS units use cell towers for triangulating there location.
Two different systems.

GPS if it can "see" enough satellites. Which can be a problem in cities with tall buildings.

Cell tower triangulation when the GPS is not working.

You can normally tell in Google maps by the size of the circle of uncertainty.
#25
Ohio
308 Posts
Joined Nov 2010
Originally posted by SRF
Two different systems.

GPS if it can "see" enough satellites. Which can be a problem in cities with tall buildings.

Cell tower triangulation when the GPS is not working.

You can normally tell in Google maps by the size of the circle of uncertainty.
Many cellphone GPS units use cell towers for triangulating there location. They use triangulation to speed up a GPS Fix by telling the device where to look for the satellites.
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#26
United States
1,345 Posts
Joined Jul 2014
Sort of.

The phone uses the cell tower triangulation to find out where it is when the GPS doesn't have a lock.

And then the phone tells the GPS where it is to help find sats.
#27
Ohio
308 Posts
Joined Nov 2010
Originally posted by SRF
Sort of.

The phone uses the cell tower triangulation to find out where it is when the GPS doesn't have a lock.

And then the phone tells the GPS where it is to help find sats.

Exactly
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#29
Palm City, Fl
4,224 Posts
Joined Dec 2002
To the OP

maps.me

is an app that may offer a solution to your question.
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#30
Philadelphia, PA
144 Posts
Joined May 2004
I thought just about all devices had a GPS receiver in them these days. I use OSMAnd on my Android phone. I have the nautical charts downloaded so that I'll be able to monitor our trans-atlantic trips in December. Open Street Maps has a wiki, and the page discussing iOS is:
http://wiki.openstreetmap.org/wiki/Apple_iOS