Reply
 
Thread Tools Search this Thread
 
Old 06 February 2004, 04:27   #1
Member
 
Country: UK - England
Town: Oxford
Make: Ribtec, Ballistic, C
Engine: 40hp 4 strokes - twi
Join Date: Apr 2002
Posts: 309
I hate technology (namly GPS)

Hi all don't know if anyone can explain this. Was running a night exercise Sunday night around Plymouth (yes it was windy). 4 GPS's of different varieties. Plotted some waypoints on the chart. (Datum wgs84) entered into 2 gps's one garman 12 and one Magellan 115 and went out on the water. They were completely up the spout one was claiming that the Yelm was 2 miles up the Tamar!! tried going to positions that I know are correct and have used hundreds of times and these were out by miles two. We had good strong satellite fixes and the units were saying that their was a good accuracy. I swiched one to datum wgs72 as it is very nearly the same as wgs84 (the difference is altitude) and this started to work. Then the all worked going south and not north. and then they all started working propoly. This is very strange as we checked the health of the system and every thing was ok.

anyone got any ideas?
__________________

__________________
dgpw is offline   Reply With Quote
Old 06 February 2004, 05:19   #2
Member
 
Country: UK - Scotland
Town: Oban
Boat name: RIB Tickle
Make: Humber Assault
Length: 5.3m
Engine: Yamaha 60ETO,Tohatsu 3.5
Join Date: Dec 2003
Posts: 371
I have noticed that I have been getting accuracy alarms for the last couple of weeks, are we going to war with somebody new this month?
__________________

__________________
http://www.argylldiving.btinternet.co.uk
Rupert Bear is offline   Reply With Quote
Old 06 February 2004, 15:03   #3
Member
 
Country: UK - England
Town: Oxford
Make: Ribtec, Ballistic, C
Engine: 40hp 4 strokes - twi
Join Date: Apr 2002
Posts: 309
um just what I was thinking but I have been assured that they uses a different coding for the servises. Hume i don't beleve them
__________________
dgpw is offline   Reply With Quote
Old 06 February 2004, 15:25   #4
DJL
Member
 
Country: UK - England
Make: Ribcraft 6.5
Length: 6m +
Engine: Suzuki DF175TG
Join Date: Apr 2002
Posts: 929
If anything GPS gets more accurate during war - during the first Golf War they turned off selective availably because the armed forces were using civilian sets.

Selective availability was completely stupid anyway like it matters if a nuclear bomb is a few 100m of target
__________________
DJL is offline   Reply With Quote
Old 06 February 2004, 15:52   #5
Member
 
Country: UK - Scotland
Town: Port Logan
Boat name: Red Fox
Make: Zodiac Pro 500
Length: 4m +
Engine: Yamaha 70hp
MMSI: 232004329
Join Date: Aug 2002
Posts: 322
Maybe not but a GPS guided ball could make a difference to your handicap!
__________________
Red Fox is offline   Reply With Quote
Old 07 February 2004, 14:39   #6
Member
 
Country: UK - Channel Islands
Town: Jersey
Boat name: t/t
Make: Honda
Length: under 3m
Join Date: Oct 2002
Posts: 255
Hi Dave,

Long time no hear? Fancy a delivery in March Jersey - Greece?

Cant answer your GPS question other than to ensure they are all set to WGS 84 and details have been put in correctly. You sure they named and numbered them correctly I know some Uni students in Plymouth can be a bit slow at times ???

In an urban environment you get multibeam reflections of the buildings which can screw the readings but unlikley to be 2 miles out?

Cheers

Karl
__________________

__________________
karlT is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 21:49.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.