[gps-talkusers] compass verses direction of travel

From: "Michael May" <mikemay@xxxxxxxxxxxxxxxx>
To: <gps-talkusers@xxxxxxxxxxxxx>
Date: Fri, 23 Aug 2013 10:23:07 -0700
There are two mechanisms for determining  direction. One is based on your
movement, irrespective of the phone or the compass. This typically uses a
sample once a second to determine your direction of travel based on your
actual movement.

 

The other method is to use the iPhone compass and hence the way the phone is
facing. 

 

In the Seeing Eye GPS, we use the word heading to mean your direction of
travel based on actual movement. We use the word Facing to indicate the way
the phone compass is facing. The compass is great when you aren't moving
while heading is best when you are moving so you don't have  to face your
phone any particular direction. I too carry my phone in a holster on my belt
upside down.

 

If you don't know which mechanism an app uses, you should test it by facing
your phone in different directions.

 

Mike

is 

 

From: gps-talkusers-bounce@xxxxxxxxxxxxx
[mailto:gps-talkusers-bounce@xxxxxxxxxxxxx] On Behalf Of Ilkka Pirttimaa
Sent: Friday, August 23, 2013 9:50 AM
To: gps-talkusers@xxxxxxxxxxxxx
Subject: [gps-talkusers] Re: An extremely basic iPhone and gps question

 

For BlindSquare you can have it in other positions too, it detects how you
have set it. It's important to have screen facing towards you. You can test
it by going into GPS info screen, selecting compass and then turn your
device in different positions. 

 

On Fri, Aug 23, 2013 at 7:37 PM, Baracco, Andrew W <Andrew.Baracco@xxxxxx>
wrote:

I have read that you should have the phone in a standing up position with
the screen facing you. A holster, or a case with a belt clip would work best
for this purpose.

 

Andy

 

 

From: gps-talkusers-bounce@xxxxxxxxxxxxx
[mailto:gps-talkusers-bounce@xxxxxxxxxxxxx] On Behalf Of Michael Malver
Sent: Friday, August 23, 2013 6:51 AM
To: gps-talkusers@xxxxxxxxxxxxx
Subject: [gps-talkusers] An extremely basic iPhone and gps question

 

Hello,

When I use my iPhone, I carry it in a bag, somewhat similar to a purse.  The
phone sits vertically in the bag so the power button is on the right.   The
pocket it is in is small, so the phone doesn't shift positions.  I find that
frequently, the iPhone tells me I'm traveling south when I'm traveling
north, or east when I'm traveling west.  It generally announces streets
properly, but can mix up turns as it reverses my direction of travel.  Both
Google maps and blindsquare exhibit this behavior, so I figure it has to do
with the iPhone rather than any specific app.  Do I need to have the phone
oriented a certain way for best results?  Would an external gps receiver
give me more accurate information?

Thanks for any tips you can give.

 

 

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[gps-talkusers] compass verses direction of travel

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