Number Of Available Satellites (signal worse after 5.1)

Kavg · Posted: Wed Jul 27, 2005 1:52 pm Post subject:

I thought you only needed 3 Sat's to triangulate your position, and any greater then 3 added to position accuracy.

8O

You learn something everyday.

Eldar · Posted: Wed Jul 27, 2005 1:58 pm Post subject:

Throbber · Occasional Visitor Joined: Apr 16, 2005 Posts: 12

Thanks again Eldar, it's good to know I'm normal. Laughing

Think I'll do as you suggest and do a rest once a month. Should the unit be on or off when you push the reset button?

Eldar · Posted: Wed Jul 27, 2005 3:10 pm Post subject:

Eldar · Posted: Wed Jul 27, 2005 3:13 pm Post subject:

Blackdog · Posted: Wed Jul 27, 2005 5:06 pm Post subject:

Eldar · Posted: Wed Jul 27, 2005 5:23 pm Post subject:

Blackdog · Posted: Wed Jul 27, 2005 5:38 pm Post subject:

Eldar · Posted: Wed Jul 27, 2005 6:12 pm Post subject:

Blackdog · Posted: Wed Jul 27, 2005 6:41 pm Post subject:

Good Afternoon Doctor,

I agree with what you say about the accuracy of 2D fixes not being as good as 3D (in a previous existence my life depended on them), but for your average Joe, who is nowadays the typical GPS user in the UK he only wants to get to Auntie Mabel's new house or perhaps a holiday destination or business address. If he can't seewhere he wants to go from a couple of hundred metres should he really be driving?? Clearly, where the more accurate 3D fixes are required for such things as Off Road driving (very contentious in some areas) or the up and coming Geocaching pastime and indeed hiking and other uplands pastimes, then much more accurate trilateration information is required and for these, yes four or more birds are required to enable pseudoranging to be as accurate as possible. My initial post was only intended to be a basic answer to a basic question. Wink

Cheers,

Blackdog
_________________
TT700 - Memory Map 2004 - NavMan iPaq

Eldar · Posted: Wed Jul 27, 2005 7:20 pm Post subject:

Good evening Mr Blackdog (as if ScaredyCat wasn't more than enough for me ;-) )

I suppose you're right and I've got carried away, also I should have phrased my first response differently - the receiver will try to track four satellites to get a more accurate fix, but failing that three satellites is enough for basic positioning.

Blackdog · Posted: Wed Jul 27, 2005 8:00 pm Post subject:

Please not Mr.......

I'm an "Oi You!", not an "excuse me Sir"

Cheers
_________________
TT700 - Memory Map 2004 - NavMan iPaq

rossb · Posted: Sun Jul 31, 2005 10:22 am Post subject: Fix times and weather

Remember that cloud cover has an effect on satellite fixes. i dont use a tomtom, but I have found satellite fix times of 45 seconds on a sunny day(cold start), and 3 minutes on a very cloudy day(cold start). If you switch on the unit for a second time after using it for a drive, you can get a lock in about 20 seconds(warm start).

Eldar · Posted: Sun Jul 31, 2005 11:40 am Post subject:

Yep, that's Garmin for you - affected by clouds and probably light breeze :D

	PocketGPS
	Web