___   __  __     _                    
 / _ \ / _|/ _|___| |__   ___  _ __ ___ 
| | | | |_| |_/ __| '_ \ / _ \| '__/ _ \
| |_| |  _|  _\__ \ | | | (_) | | |  __/
 \___/|_| |_| |___/_| |_|\___/|_|  \___|

          ____  _               _   
         |  _ \(_)_ __ ___  ___| |_ 
         | | | | | '__/ _ \/ __| __|
         | |_| | | | |  __/ (__| |_ 
         |____/|_|_|  \___|\___|\__|


There are two main ways that the LuckGrib Offshore weather service can deliver its data: email or a more direct method using a low speed internet connection. This note is about the low speed internet connection method.

In September of 2018, Mailasail announced that it was supporting direct downloads of LuckGrib data through its RedBox device. An article discussing this was posted to the LuckGrib blog.

(&. &&, .&&. ,&& /&& (&& %&% & &&( &&/ *&&( &&&( && *&&&% %&&&% &&& &&&&( &&&&* .&&&&. ,&&&& /&&&& #&&&& %&&&% &&& .&&&&/ ,&&&&, /&&&&. (&@&& #&@&% %&&& .(/&&&&%(* #%%%%%%%%%%%%#(*. /%%%%%%%%%%%%%%%%%%%%%%%%%#/,. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%#/,. *%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%#(*. .%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%# (%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%/ *%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%/* #%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%(/( ,%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%///, #%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%(/(/ /%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%(/// .#%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%@%&&&&%%%%%%%%%%%%%%%%(/// #%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%&%@&&@%&@%&%%%%&&&%%%%(/// #%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%&&&&%&@%@@%%%@&%@%@%%%%(/// &%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%@%%%%%%%%%%%%%%&%%@%%%%(/// &%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%@%@@%@%%@%@%%%%%%%@%%%%(///. &%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%&&%&%&@%@@%@@%%@&%%&%%%%(/// %%%%%&%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%&&@&&%%%&%@&%@%%%%(///. %&&%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%&&%%%%(///, *#%%%%%%%%%%%%%%%%%%%%%%%% ,/#%%%%%%%%%%%%%%%%%%%%#(/(* ,(%%%%%%%%%%%%%% . . ,/#%%%%%%%%%(((, ,(%%%%%(*. .** //*. .*. (%%&((/ ./#%%%%#/.* .,*.. #%%%#/ ./#%%%%#/%%%%(

The RedBox is a device which provides a WiFi bridge between a variety of satellite phones and a Mac or iPhone/iPad. The internet connection that is established is slow, as the satellite connection is being used. However people have been able to use this connection with the standard version of LuckGrib to download weather data. The Offshore Compact weather service provides a much more optimized workflow for these people.

A number of people have also been able to figure out a way of downloading normal LuckGrib data over their Satellite setup - these people will greatly benefit by moving to this new Offshore service.

Similar to the email delivery mechanism, LuckGrib does not have a preference (or guidance) on how to setup the direct internet connection. Please work with your vendors for this.

In addition to satellite phones being used with this low speed internet connection, you may also find that your cellphone can be used.

                                                    ____
                                         v        _(    )
        _ ^ _                          v         (___|__)
       '_\V/ `
       ' oX`
          X                            v
          X             -Yipee!
          X                                           .
          X        \O/                                |\
          X.a##a.   M                                 |_\
       .aa########a.>>                              __|__
    .a################aa.                           \   /
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                                                 s/v Luckness

For example, the picture above is of s/v Luckness while we were anchored off of a remote and beautiful island in the Vava’u region of Tonga. While there, we were able to recive a very weak 3G cell signal. The Offshore Compact weather service would have been perfect in that situation.

When LuckGrib is configured to use the low speed internet download mechanism, it will request that the files it receives are Offshore Compact files. The GRIB request window is specialized for this new task and provides a more informative download experience.

As is normal in LuckGrib, you create a GRIB request by specifying the model (GFS, CMC, WW3, RTOFS, NBM, etc), parameters (wind, pressure, rain, radar, etc), region, resolution and forecast duration. An approximate size for the download is calculated and shown. You will want to watch this estimate and adjust the request parameters to keep the size within a reasonable range, based on the speed of your communications hardware.

  ____
 /\' .\    _____
/: \___\  / .  /\
\' / . / /____/..\
 \/___/  \'  '\  /
          \'__'\/

Its not uncommon for you to start the download of a file over a slow internet connection only to have an error of some sort occur and for the internet connection to drop out. This is the real world after all and things do not always go perfectly. Satellites may pass beneath the horizon, there may be interference of some kind - this type of drop out should not be unexpected when accessing data remotely.

The faster you can complete your download the better the chances you will not encounter an error. An Offshore Compact file will be roughly 1/2 the size of an ordinary file, and so you are 1/2 as likely to encounter an error.

If you do encounter a download error, LuckGrib will save all of the data it has received for the GRIB request. When you next reconnect and download this request again, LuckGrib will inform the server that it has a partial download result already, along with some information describing it. If the server agrees that the data retained is valid, the server will continue the download from where the error occurred rather than starting all over again.

This ability to restart after an error can save a considerable amount of time, money (if you are paying for data) and your patience - it can be very annoying waiting for old fashioned software to re-download data it already downloaded, over and over again.



Copyright © 2019 Craig McPheeters. All rights reserved.