Reply
 
Thread Tools Search this Thread
 
Old 23 August 2005, 04:39   #1
DGR
Member
 
Country: UK - Wales
Town: Barmouth
Boat name: Blue Marlin
Make: Ribcraft
Length: 7m +
Engine: Yanmar 315/Bravo 2X
MMSI: 235020218
Join Date: Jun 2003
Posts: 827
Garmin Tide Times

I have an odd problem with the tide prediction on my Garmin 188C. Yesterday, the Mapsource software on the PC gave me 2.0m until 14:43, yet the Garmin unit - using the same BlueChart database, gave me 2.0m until 15:18 - when there was definately NOT 2.0 metres of water in the harbour ...

Anyone got any ideas why there would be a difference?!?

DGR...
__________________

__________________
DGR is offline   Reply With Quote
Old 23 August 2005, 05:12   #2
Member
 
Pete7's Avatar
 
Country: UK - England
Town: Gosport
Boat name: April Lass
Make: Moody 31
Length: 9m +
Join Date: Aug 2001
Posts: 4,850
Have you got the latest operating system software release? there was an update a couple of months ago which JW kindly down loaded onto a spare card for me. PM me your address and I will loan you the card. Update took 2 minutes and self installs.

Also having a problem with a 188c at the moment. Not sure if its the internal battery failing causing the set to forget were it is or the cable from the antena to the head unit which has a poor connector so the set fails to get a good signal.

This might help:

Garmin tide stations

Pete
__________________

__________________
Pete7 is offline   Reply With Quote
Old 23 August 2005, 10:50   #3
DGR
Member
 
Country: UK - Wales
Town: Barmouth
Boat name: Blue Marlin
Make: Ribcraft
Length: 7m +
Engine: Yanmar 315/Bravo 2X
MMSI: 235020218
Join Date: Jun 2003
Posts: 827
Pete,

Thanks for that - I've done an update fairly recently, but Garmin have sent out three or four this year so far for the 188C!! The latest one I've got is from June and is version 6.10 - I'll check to see if I did upgrade it to that version, and then see if it works!!

Cheers,

Dylan...
__________________
DGR is offline   Reply With Quote
Old 23 August 2005, 14:08   #4
Member
 
Hightower's Avatar
 
Country: UK - England
Town: Fareham
Length: 6m +
Join Date: Sep 2003
Posts: 7,855
I've had conflicting info from my Garmin 182c about tide times, but its usually an hour out! When I first found the prob I though, hey....Must be the Time not being set right, but it was! I had to offset the time manually to compensate, then the next time it went the other way and had to reset the correct time. I wondered if it the units deciphering of the satelite signal ment the sometimes it goes to UCT instaed of GMT. Weird!
__________________
Hightower is offline   Reply With Quote
Old 18 September 2005, 09:08   #5
DGR
Member
 
Country: UK - Wales
Town: Barmouth
Boat name: Blue Marlin
Make: Ribcraft
Length: 7m +
Engine: Yanmar 315/Bravo 2X
MMSI: 235020218
Join Date: Jun 2003
Posts: 827
I've done the update to the 188C hardware, and high tide and low tide times and heights seem consistant - but its still off in-between!! Today the PC software was telling me I had to be out of the harbour by 13:00 (2.0m of water), but the 188C was telling me that I had an extra half hour!!

When you select tide stations on the Garmin - what does it actually do? It seems to take a while (20 - 30 seconds) to 'find' the stations - which seems longer than it would need to just look up info on the memory card.

While I accept that I can be a little simple at times - so it could well be operator error - but I still don't get why (or how) there can be a difference in the same dataset!!

Anyone got any ideas?

Dylan...
__________________
DGR is offline   Reply With Quote
Old 19 September 2005, 08:09   #6
Member
 
Country: Other
Town: Hayle, Kernow
Boat name: Spare RIB
Make: Narwhal
Length: 5m +
Engine: 130 Yam Outboard
Join Date: Mar 2005
Posts: 642
Hi Dylan
Give the tide station and a date to compare with my Mapsource and 168 Sounder.

This might help determine if the tide chart predictor it self is wrong.

Shaggy
__________________
Shaggy is offline   Reply With Quote
Old 20 September 2005, 04:23   #7
Member
 
Country: UK - England
Town: Alton
Boat name: Arrow Flight
Make: Humber Destroyer
Length: 7m +
Engine: Mercury 175 EFI
MMSI: 235026883
Join Date: Apr 2003
Posts: 60
Missing Tide times

Have noticed recently that my tide times have disappeared from my 188C. Two things may have caused this and I'm not sure how to resolve it.

First was an upgrade to ver6.10 software (unlikely though as you all seem to have tide times with 6.10).

Second is a change from a pre-made Garmin chart chip (out of date now) to a blank Garmin 32Mb chip onto which I've downloaded my maps, routes and waypoints from v7 of the Blue Chart maps using current Map Source software.

I have a feeling the problem is related to not copying a tide map onto the blank chip but I don't know how to do this and can't find a link on the Garmin site. I've had a look through previous postings but can't find any tips there.

So if anyone knows a solution I'd be very grateful.

Regards

Colin
__________________
Colin
Outnabout is offline   Reply With Quote
Old 20 September 2005, 05:08   #8
Member
 
Country: Other
Town: Hayle, Kernow
Boat name: Spare RIB
Make: Narwhal
Length: 5m +
Engine: 130 Yam Outboard
Join Date: Mar 2005
Posts: 642
Hi Dylan

This should read:

Give me a tide station and a date to compare with my Map source and my 168 Sounder.

This might help determine if the tide chart predictor it self is wrong at that tide station.

Hi Colin

The tides have to be uploaded as a map to the GPS, I would download your working maps and routes, waypoints and tracks from you GPS into map source, ensure all your working maps are present under maps on the left hand side.

Then select the tide and marine services from the drop down box (top right), then select the tide map area by using the map tool, once selected you should see it added to your map selection on the left under maps something like:

Europe BlueChart Atlantic v7.5 Tides and Marine Services 131 KB

Then upload this with your other working maps, routes, waypoints etc to the GPS/ Card.

So your map selection will look something like this (Note the top one):

Europe BlueChart Atlantic v7.5 Tides and Marine Services 131 KB
GB1121 (500000) BlueChart Atlantic v7.5 137 KB
GB1123 (500000) BlueChart Atlantic v7.5 102 KB
GB1149 (75000) BlueChart Atlantic v7.5 60 KB
GB1156 (75000) BlueChart Atlantic v7.5 49 KB
GB1165 (75000) BlueChart Atlantic v7.5 92 KB
GB1178 (200000) BlueChart Atlantic v7.5 140 KB
GB1179 (150000) BlueChart Atlantic v7.5 107 KB
GB1267 (75000) BlueChart Atlantic v7.5 83 KB
GB1410 (200000) BlueChart Atlantic v7.5 113 KB
GB147 (A) (15000) BlueChart Atlantic v7.5 37 KB
GB147 (B) (12500) BlueChart Atlantic v7.5 40 KB
GB147 (C) (12500) BlueChart Atlantic v7.5 7 KB
GB154 (A) (35000) BlueChart Atlantic v7.5 76 KB
GB154 (B) (35000) BlueChart Atlantic v7.5 12 KB
GB18 (5000) BlueChart Atlantic v7.5 59 KB
GB2345 (A) (15000) BlueChart Atlantic v7.5 32 KB
GB2565 (150000) Atlantic BlueChart v4.00 122 KB
GB2565 (150000) BlueChart Atlantic v7.5 93 KB
GB2649 (500000) BlueChart Atlantic v7.5 59 KB
GB2655 (325000) Atlantic BlueChart v4.00 150 KB
GB32 (A) (20000) BlueChart Atlantic v7.5 5 KB
GB32 (C) (12500) BlueChart Atlantic v7.5 104 KB
GB32 (D) (12500) BlueChart Atlantic v7.5 14 KB
GB777 (75000) BlueChart Atlantic v7.5 74 KB


Also I have a spare BlueChart Atlantic v7.5 update disk including Tides and Marine Services 131 KB, I would be happy to pop it in the post to you if you or anyone else PMs me with their address.

I have 3 spare disks now after sending a complaint email to every email address I could get my hands on at Garmin, as they failed to reply to my previous two emails about not receiving the 7.5 update disk.


Shaggy
__________________
Shaggy is offline   Reply With Quote
Old 20 September 2005, 08:37   #9
DGR
Member
 
Country: UK - Wales
Town: Barmouth
Boat name: Blue Marlin
Make: Ribcraft
Length: 7m +
Engine: Yanmar 315/Bravo 2X
MMSI: 235020218
Join Date: Jun 2003
Posts: 827
Shaggy,

Thanks for that - I can give you the PC based data, and I'll get the same data from the 188C tomorrow.

At Barmouth on the 16th October (a topical date!!)

High Tide is 4.79 metres at 07:58 and
Low Tide is 0.70 metres at 15:26.

Between these, there is 2.0 metres of tide in Barmouth Harbour at approx 12:10 (1.99m).

Let me know if this matches with your dataset/prediction!!

Cheers,

Dylan...
__________________
DGR is offline   Reply With Quote
Old 20 September 2005, 11:56   #10
Member
 
Country: Other
Town: Hayle, Kernow
Boat name: Spare RIB
Make: Narwhal
Length: 5m +
Engine: 130 Yam Outboard
Join Date: Mar 2005
Posts: 642
Hi
Results taken from my Mapsource:

Barmouth
16/10/2005 07:58:07 4.79m High
16/10/2005 15:26:14 0.70m Low

Time at 12:10 giving 2m of water

So the results are the same.

I have checked St. Ives against the BBC coast and sea page times in GMT

BBC have St. Ives as
0023 Low 0.4
0613 High 6.9
1240 Low 0.5
1834 High 7.1

Garmin show:
00:56 Low 0.55
06:46 High 6.50
13:15 Low 0.77
19:05 High 6.41


Did you see the disclaimer in the Notes on Marsource?

This product has been derived, in part, from Admiralty charts and publications with the permission of the UK Hydrographic Office and the Controller of Her Majesty’s Stationery Office. All rights reserved.

WARNING: No National Hydrographic Office has verified the information in this product and none accept liability for the accuracy of reproduction or any modifications made thereafter. No National Hydrographic Office warrants that this product satisfies national or international regulations regarding the use of the appropriate products for navigation.

Cheers Shaggy
__________________

__________________
Shaggy 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 21:52.


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