Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 10-09-2012, 08:09   #46
Registered User
 
funjohnson's Avatar

Join Date: Mar 2010
Location: Currently Indiantown FL
Boat: 37' aluminum pilothouse "Elements"
Posts: 1,846
Re: Best Way For Weather Reports

Quote:
Originally Posted by SV Demeter View Post
Last night I installed viewfax on the boat computer and dowloaded some gribs and a few other items.

Just now playing with this program too. Do you see a way to request not only GRIB files, but weather faxes all in one request? It seems this would be the most efficient for data use... if we can clump all request into one time send a receive vs having to log onto the server for all GRIBs and then for wefax.
__________________

__________________
MJSailing.com - Written Blog
Youtube MJ sailing - Vlog
funjohnson is online now   Reply With Quote
Old 10-09-2012, 09:03   #47
Registered User

Join Date: Dec 2010
Location: W Carib
Boat: Wildcat 35, Hobie 33
Posts: 7,921
Re: Best Way For Weather Reports

Quote:
Originally Posted by funjohnson View Post
Just now playing with this program too. Do you see a way to request not only GRIB files, but weather faxes all in one request? It seems this would be the most efficient for data use... if we can clump all request into one time send a receive vs having to log onto the server for all GRIBs and then for wefax.
I run ViewFax too and don't know of anyway to do that using ViewFax.

However, you can probably construct a request to Saildocs to get what you want in one email message. Then you can display the files using ViewFax. See esp the "sub" and "send" commands.
__________________

__________________
belizesailor is online now   Reply With Quote
Old 10-09-2012, 09:46   #48
Moderator
 
Paul Elliott's Avatar

Cruisers Forum Supporter

Join Date: Sep 2006
Posts: 3,865
Images: 4
Re: Best Way For Weather Reports

Quote:
Originally Posted by funjohnson View Post
Just now playing with this program too. Do you see a way to request not only GRIB files, but weather faxes all in one request? It seems this would be the most efficient for data use... if we can clump all request into one time send a receive vs having to log onto the server for all GRIBs and then for wefax.
As belizesailor says, you can request multiple WFAXes and GRIBs in a single email to Saildocs. Be aware that if you are using SSB Sailmail then you will not be able to get the WFAX images as these files are larger than Sailmail allows. If you are a ham and using Winlink, then these WFAX files are allowed (but it will take a while to transfer). With satphone email these files are pretty reasonable in size.
__________________
Paul Elliott, S/V VALIS - Pacific Seacraft 44 #16 - Friday Harbor, WA
www.sailvalis.com
Paul Elliott is online now   Reply With Quote
Old 27-12-2012, 18:30   #49
Registered User
 
Ozbullwinkle's Avatar

Join Date: Sep 2009
Location: Caringbah, Sydney, Australia
Boat: Farr 44 Ocean Racer - Pit crew & backup helm.
Posts: 602
Images: 16
Re: Best Way For Weather Reports

I have read all the posts in this thread which is of interest to me as I am preparing for a Pacific crossing from St Martin to Vanuatu in March 2013. I have a new Iridium Satphone with the Accesspoint module which makes the phone a wireless hotspot to enable web access through an onboard laptop.

So, to summarize this is what it appears that I need to do:-

1. Join Sailmail which is $250 per year which will give me a compressed email account which is much more effective in terms of bandwith usage through the Satphone than say a Hotmail email account.

2. Request GRIB files and Weather files through Saildocs which are free of charge. (I assume that these weather files would be synoptic charts - Correct?)

3. Install the Viewfax application on the laptop to view these files which will be transmitted by Saildocs to the Sailmail email account.

4. Once setup I would of course test this setup to become familiar with it prior to setting off on the passage.

Have I got everything covered?

Any other suggestions?

Thanks
__________________
Ozbullwinkle is offline   Reply With Quote
Old 27-12-2012, 18:42   #50
Moderator
 
Paul Elliott's Avatar

Cruisers Forum Supporter

Join Date: Sep 2006
Posts: 3,865
Images: 4
Re: Best Way For Weather Reports

I think you've got it! Using Saildocs, you can get just about any WX chart that the NOAA produces. There should be a list of available filenames somewhere in the Saildocs documentation, but it's pretty hard to find (at least for me). I've got a list of the ones I usually request (somewhere around here) -- let me know if you need help finding the charts.

Regarding the Accesspoint module, make sure that you are able to force it to disconnect when you are done using it. There's probably a trick, but I found that once it connected, it kept my Iridium connection active. That's an unpleasant way to waste airtime and $$$!

I helped a friend sail his boat from Fiji to Vanuatu several years ago, and spent a couple of days in Port Vila. I loved it, and can't wait to return to those islands for a long visit.
__________________
Paul Elliott, S/V VALIS - Pacific Seacraft 44 #16 - Friday Harbor, WA
www.sailvalis.com
Paul Elliott is online now   Reply With Quote
Old 27-12-2012, 18:54   #51
Moderator
 
Paul Elliott's Avatar

Cruisers Forum Supporter

Join Date: Sep 2006
Posts: 3,865
Images: 4
Re: Best Way For Weather Reports

Here's some info on requesting WFAX charts via Sailmail:

Here is the NOAA directory showing some of the available files:
Radiofax Charts - Pt. Reyes, CA
Look at the filenames under the "TIF" buttons. Saildocs knows how to get (and compress) these if you just ask for the filename -- the full path isn't required.

These are the wfax images I get for a West Coast USA to Hawaii run:

PYBA90.TIF (the eastern portion of the n pac surface analysis) PWBI10.TIF (the 48-hour ne pac surface forecast)
PWBM99.TIF (the 96-hour ne pac forecast)
PWBE10.TIF (the 24-hour wind / wave forecast)

No doubt you will want SWPAC charts instead!

I request these by sending email to query@saildocs.com with the body text (for example) "send PYBA90.TIF" (one file request per line.) You can also subscribe, which is what I usually do. Dig onto the saildocs subscription details, you can schedule the delivery for any given time (to suit your habits and the update schedule of the images / data you are requesting.) I can walk you through this is you like, but once you find the info it's not complicated. You can find on Saildocs the schedule details for the GFS forecast computer run, which provides the GRIB data.
__________________
Paul Elliott, S/V VALIS - Pacific Seacraft 44 #16 - Friday Harbor, WA
www.sailvalis.com
Paul Elliott is online now   Reply With Quote
Old 27-12-2012, 22:16   #52
Senior Cruiser
 
jackdale's Avatar

Cruisers Forum Supporter

Join Date: Mar 2008
Location: Calgary, AB, Canada
Posts: 5,040
Images: 1
Re: Best Way For Weather Reports

Someone earlier mentioned that fronts are not visible on grib files. While that is true, if you get the precipitation included you can use that and wind shifts to determine the location of fronts.
__________________
ISPA Yachtmaster Ocean Instructor Evaluator
Sail Canada Advanced Cruising Instructor
IYT Yachtmaster Coastal Instructor
ASA 201, 203,204, 205, 206, 214
As I sail, I praise God, and care not. (Luke Foxe)
jackdale is offline   Reply With Quote
Old 27-12-2012, 22:37   #53
Registered User
 
Dos Gatos's Avatar

Join Date: Nov 2011
Location: SF Bay
Boat: O'Day 25
Posts: 100
Re: Best Way For Weather Reports

Grundig Yachtboy from ebay, jvcomm software and a 12 year old laptop with xp and a mini pin male/male patch cord to receive noaa weatherfax and telex. Total setup cost <$120us. Worked fine for coastal CA to Gulfo de California, Hawaii and back.
__________________
Dos Gatos is offline   Reply With Quote
Old 27-12-2012, 22:40   #54
Senior Cruiser
 
jackdale's Avatar

Cruisers Forum Supporter

Join Date: Mar 2008
Location: Calgary, AB, Canada
Posts: 5,040
Images: 1
Re: Best Way For Weather Reports

Quote:
Originally Posted by Dos Gatos View Post
Grundig Yachtboy from ebay, jvcomm software and a 12 year old laptop with xp and a mini pin male/male patch cord to receive noaa weatherfax and telex. Total setup cost <$120us. Worked fine for coastal CA to Gulfo de California, Hawaii and back.
Yep - weatherfax is great.

I must check out that setup.
__________________
ISPA Yachtmaster Ocean Instructor Evaluator
Sail Canada Advanced Cruising Instructor
IYT Yachtmaster Coastal Instructor
ASA 201, 203,204, 205, 206, 214
As I sail, I praise God, and care not. (Luke Foxe)
jackdale is offline   Reply With Quote
Old 27-12-2012, 23:20   #55
Registered User

Join Date: Dec 2009
Posts: 3,016
Images: 4
Re: Best Way For Weather Reports

Also not shown on GRIB files are Tropical Revolving Storms ... until they are huge. The Synoptic charts are quite informative.
__________________
daddle is offline   Reply With Quote
Old 28-12-2012, 09:32   #56
Senior Cruiser
 
jackdale's Avatar

Cruisers Forum Supporter

Join Date: Mar 2008
Location: Calgary, AB, Canada
Posts: 5,040
Images: 1
Re: Best Way For Weather Reports

On a forced choice between and weatherfax, I will go with weatherfax which has sea states.
__________________
ISPA Yachtmaster Ocean Instructor Evaluator
Sail Canada Advanced Cruising Instructor
IYT Yachtmaster Coastal Instructor
ASA 201, 203,204, 205, 206, 214
As I sail, I praise God, and care not. (Luke Foxe)
jackdale is offline   Reply With Quote
Old 28-12-2012, 12:14   #57
Senior Cruiser

Cruisers Forum Supporter

Join Date: Mar 2007
Location: Santa Cruz
Boat: Boatless Again
Posts: 4,314
Re: Best Way For Weather Reports

I'd choose gribs--smaller files, more detail, and the forecast is for every 6 hours for up to 8 days. The fronts are easy to see from the wind shifts, they do wind, pressure, wave height, and precipitation. They also show the TRS development way ahead of time, even if they are not as accurate on the TRS wind fields.

My experience with gribs is that if you add 5 to 10 knots to the forecasts, they are pretty accurate in the open ocean.

In addition to using gribs for half a circumnavigation, I also did the last virtual Volvo Ocean race. When we were among the fleet of real boats, they generally went about 3-5 knots faster. While we were sailing to the same polars as the real boats, they were seeing more real wind. The only time the virtual fleet went faster was in the Southern Ocean, where the virtual boats didn't need to worry about falling apart in the strong winds.
__________________
donradcliffe is offline   Reply With Quote
Old 29-12-2012, 23:21   #58
Registered User

Join Date: Dec 2009
Posts: 3,016
Images: 4
A GRIB might show a TRS. My 2 year experience in the SW Pacific typhoon nursery is they do not. A few random 5 knot barbs could be a calm area or a soon-to-be-dangerous TRS. The synoptic or other proper information should be regularly examined. I read the text summaries as often as looking at the pretty GRIB picture.
__________________
daddle is offline   Reply With Quote
Old 30-12-2012, 14:07   #59
Senior Cruiser

Cruisers Forum Supporter

Join Date: Mar 2007
Location: Santa Cruz
Boat: Boatless Again
Posts: 4,314
Re: Best Way For Weather Reports

Pictures are worth 1000 words. Can you find the TRS?? Which weather would you prefer? Note that the GFS model in the grib file underpredicts the max winds around the cyclone by 30k, but who really cares? These were all downloaded for free through Airmail/Winlink.
Attached Thumbnails
Click image for larger version

Name:	grib.JPG
Views:	126
Size:	190.0 KB
ID:	51899   Click image for larger version

Name:	wfax.JPG
Views:	136
Size:	210.7 KB
ID:	51900  

Click image for larger version

Name:	text.JPG
Views:	123
Size:	159.9 KB
ID:	51901  
__________________
donradcliffe is offline   Reply With Quote
Old 30-12-2012, 14:52   #60
Registered User
 
SV Demeter's Avatar

Join Date: Dec 2009
Location: Cruising Eastern Caribbean
Boat: Wauquiez Amphitrite 43- Demeter
Posts: 1,164
I did not bother with the $250 to sailmail just yo get compressed email offshore. I installed view fax (free) use it through my iridium phone. No accesspoint just the phone and external ant. Prepaid card for the phone. I pull gribs from gfs and other models keeping my file size to 15kb or smaller. Get the query set up in view fax then connect the iridium and hit send.

I then use my Kaito reciever and jvcomm for the noaa maps. They take a lot of iridium time and you can get then for free just as clear with jvcomm. I find using the sat phone just for small gribs keeps the airtime charges low and using the NOAA faxes helps see the thins gribs don't show. I could not justify the $250 to sailmail or ocens just for the compression of email. Who wants email offshore? Txt is plenty fine for me off the iridium and if I'm really concerned I just call. Ymmv.
__________________

__________________
Ted Reshetiloff
SV-Demeter
http://svdemeter.wordpress.com/
SV Demeter is offline   Reply With Quote
Reply

Tags
weather

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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 -7. The time now is 16:58.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.