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Pocket GPS World Forum Index
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  Topic: GPS receiver life
jad12

Replies: 5
Views: 635

PostForum: GPS Receivers   Posted: Sun May 03, 2020 1:15 pm   Subject: GPS receiver life
When you say same place, how far apart are they? They are line of sight so some sats could be blocked at the time for some receivers. There is also maybe multipath happening where reflected signals in ...
  Topic: Satellite change reason for losing signals on older SatNavs?
jad12

Replies: 4
Views: 1853

PostForum: Advanced GPS Lounge   Posted: Mon Mar 09, 2020 9:55 am   Subject: Satellite change reason for losing signals on older SatNavs?
Hi azlan101

Did you try the reset? If that didn't do seems a bit of a mystery.

Can you identify what the signal problems are?

Actually the satellites do change, in a way. They move. But, ther ...
  Topic: Map coordinates confusion - UK Based
jad12

Replies: 6
Views: 1153

PostForum: Non-Technical Speed Camera Discussions   Posted: Wed Sep 26, 2018 4:16 am   Subject: Map coordinates confusion - UK Based
Hi all

As for plot/input of a GPS lat/long not showing where you really are Kritou is dead right. Different regions have different datums based on different best fit spheroids. Many designed years ...
  Topic: Same place - different Lat & Long between Google and Gar
jad12

Replies: 30
Views: 4207

PostForum: Garmin Portable Navigation Devices   Posted: Mon Apr 09, 2018 7:59 am   Subject: Same place - different Lat & Long between Google and Gar
Sorry don't think they do. Trying again

https://www.dropbox.com/s/n8igvxpg2cb3rjt/geodetic.PNG?dl=0

https://www.dropbox.com/s/kymhq2smovsk9yc/geodetic%20grid%201.PNG?dl=0

https://www.dropbox. ...
  Topic: Same place - different Lat & Long between Google and Gar
jad12

Replies: 30
Views: 4207

PostForum: Garmin Portable Navigation Devices   Posted: Mon Apr 09, 2018 7:39 am   Subject: Same place - different Lat & Long between Google and Gar
Example continued.

Greenwich Observatory from Google Earth 51 28 36.51N,0 00 01.91W

One piece of software I use is Geodetic Calculator. The lat/long is entered as a WGS84 geodetic coordinate. As ...
  Topic: Same place - different Lat & Long between Google and Gar
jad12

Replies: 30
Views: 4207

PostForum: Garmin Portable Navigation Devices   Posted: Sun Apr 08, 2018 7:36 pm   Subject: Same place - different Lat & Long between Google and Gar
Sorry Gentlemen

Dumb or wot. As well as posting images need to read through on quotes. Seems like mine didn't come right. Simple surveyor.

Cheers
  Topic: Same place - different Lat & Long between Google and Gar
jad12

Replies: 30
Views: 4207

PostForum: Garmin Portable Navigation Devices   Posted: Sun Apr 08, 2018 7:24 pm   Subject: Same place - different Lat & Long between Google and Gar
Hi All

Quick(ish) for now and I will continue the eg when read up on how to post images.
I am but a simple surveyor. It's also latish at night in Vietnam.


[And yes the Greenwich meridian line ...
  Topic: Same place - different Lat & Long between Google and Gar
jad12

Replies: 30
Views: 4207

PostForum: Garmin Portable Navigation Devices   Posted: Sun Apr 08, 2018 12:21 pm   Subject: Same place - different Lat & Long between Google and Gar
Will do my best with the example.

I've picked the Greenwich Observatory which from Google Earth is
51deg 28min 36.51secs N, 0 00' 01.91"W. This is WGS84 lat/long the geodetic coordinate in Geodet ...
  Topic: Same place - different Lat & Long between Google and Gar
jad12

Replies: 30
Views: 4207

PostForum: Garmin Portable Navigation Devices   Posted: Sun Apr 08, 2018 5:59 am   Subject: Same place - different Lat & Long between Google and Gar
Areas that are different are so because the WGS84 datum and spheroid (different things just have the same name) don't work very well. They have their own pre GPS best fit. This minimises distortion wh ...
  Topic: Same place - different Lat & Long between Google and Gar
jad12

Replies: 30
Views: 4207

PostForum: Garmin Portable Navigation Devices   Posted: Fri Apr 06, 2018 5:26 am   Subject: Same place - different Lat & Long between Google and Gar
Good good BigJohnD, you have it sorted. However you may find similar in other countries also. Datums have been mentioned.

Goople Maps, and Earth, are global and appropriately use a global system, t ...
  Topic: Compass Rose on screen
jad12

Replies: 3
Views: 1656

PostForum: Beginners GPS Lounge   Posted: Thu Dec 07, 2017 10:35 am   Subject: Compass Rose on screen
Many thanks for this, I will pass it on.

I would say if he was military then yes but it would go;
all of them, lookout, lookout, lookout, all of them again.

Many cheers
  Topic: Compass Rose on screen
jad12

Replies: 3
Views: 1656

PostForum: Beginners GPS Lounge   Posted: Thu Dec 07, 2017 4:02 am   Subject: Compass Rose on screen
I have recently been asked a question I could not answer as I'm not up to date with modern satnavs.

Are there any models that show a compass rose on the screen or something to indicate heading/dire ...
  Topic: The New Driving Test
jad12

Replies: 3
Views: 1633

PostForum: News And Latest Information   Posted: Fri Nov 17, 2017 5:59 am   Subject: The New Driving Test
Hi Everyone

I am interested in any thoughts and opinions of the introduction of satnav into the UK driving test.

I'm sure this will not be much of an issue for you and in any case you are satnav ...
  Topic: How wrong the map?
jad12

Replies: 0
Views: 4941

PostForum: Advanced GPS Lounge   Posted: Wed Jun 14, 2017 9:50 am   Subject: How wrong the map?
I'm looking for any info on map errors.

It's hard to quantify and probably variable from map to map but any best guesses on percentage of things wrong on a recently updated map through its update l ...
  Topic: Constructing Satnav Maps
jad12

Replies: 7
Views: 5689

PostForum: TomTom/TeleAtlas Digital Map Data   Posted: Wed May 24, 2017 3:50 am   Subject: Constructing Satnav Maps
In addition. Just had a thought -- I am slow.

Do modern units give a lat/long readout of position? The ones I have seen, in Vietnam taxis, do not. But maybe this is something in settings that would ...
 
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