| Author |
Message |
 Topic: GPS receiver life |
jad12
Replies: 5
Views: 5145
|
 Forum: 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: 4375
|
Forum: 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: 3081
|
Forum: 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: 8643
|
Forum: 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: 8643
|
Forum: 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: 8643
|
Forum: 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: 8643
|
Forum: 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: 8643
|
Forum: 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: 8643
|
Forum: 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: 8643
|
Forum: 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: 4029
|
Forum: 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: 4029
|
Forum: 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: 3051
|
Forum: 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: 6474
|
Forum: 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: 9956
|
Forum: 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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