_               _     ____      _ _     
 | |   _   _  ___| | __/ ___|_ __(_) |__  
 | |  | | | |/ __| |/ / |  _| '__| | '_ \ 
 | |__| |_| | (__|   <| |_| | |  | | |_) |
 |_____\__,_|\___|_|\_\\____|_|  |_|_.__/ 

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

The LuckGrib Offshore Compact weather file service is highly optimized for efficient delivery of weather data to offshore sailors and anybody else communicating over slow, low bandwidth connections.

There are many related parts to the Offshore Compact weather file service, the most notable of which is the new file format used for the delivery of weather data: the LuckGrib Offshore Compact weather file. The WMO GRIB file format has been around since the 1980’s. The Offshore Compact file format is an improvement over GRIB for compact storage of weather data.

When downloading weather data using a satellite phone the download speed is commonly less than 300 bytes per second. When downloading via a HF radio connection, the speed is often slower than 100 B/s.

                   ,-.
                   | |
                   | |
          ,-"""""""-.|
         /  __:::__()\
        J ."_______". L
        JJ,"       ".LL
        |J|         |L|
        |||         |||
        L||         ||J
        LJ|So slow! |LJ
        LJ._________,LJ
        L ___     ___ J
        | \__)---(__/ |
        J----(===)----L
         L\ "-___-" /J
         | "-------" |
         |           |
         |           |
         |           |
         |           |
         |           |
         |           |
         |           |
         |    ...    |
         "-----------"

The Offshore Compact file format delivers much greater file compression than any other available technology - typically Offshore Compact files are 50% the size of the equivalent GRIB file. This is a huge improvement for weather file access over low bandwidth (slow) connections.

There are many advantages to the Offshore service:

Note that the LuckGrib Offshore Compact weather service is a system, not simply a file format. Elements of the system work together to provide the best and most efficient experience possible.

Offshore Compact file compression examples

For those who prefer pictures, here is the compression story for the Offshore Compact file:

------------
|          |      -----------
|          |      |         |
|          |      |         |      --------
|          |      |         |      |      |
|          |      |         |      |      |
|          |      |         |      |      |
------------      -----------      --------
 Normal GRIB       Others       Offshore Compact
    file                             file

Notice how much smaller the Offshore Compact file is!

For those who like a few details with their pictures, the following table lists a variety of real files which are typical for offshore sailors. Click any of the filenames for more detail along with the ability to download the files for examination and verification:

NameOriginal size
(bytes)
Compact size
(bytes)
Saved
063544.ww3_wind_3.grb15,7447,59352%
093948.ww3_wind_5.grb98,15244,39155%
20151001_002917_.grb41,08711,54272%
ECMWF_20180507_12.grb36,89813,76263%
GFS.050.20190113.12.grb2132,16755,71658%
GFS.075.20190113.12.grb266,39628,88856%
GFS.100.20190113.12.grb243,89018,31658%
GFS20160511040500755.grb12,9406,50650%
GFS_20181115_00.grb26,49612,70652%
PWC_20160924_09.grb63,99228,72955%
WW3.20180813.06.grb229,4545,60581%
gfs20180802210007058.grb6,8383,50749%
gfs20180916065401993.grb16,8247,50555%
gfs20190110185803667.grb27,60212,68254%

If you have a GRIB file you consider typical of your usage and you believe none of these examples represent it, please forward the file to craig@luckgrib.com and it can be added to this list of examples.

Additional detail

Just as with LuckGrib, the Offshore Compact weather service is available on macOS and iOS (iPhone and iPad.)

There are many advantages of this new Offshore weather service over other available services:

While the compression methods in the Offshore Compact file format are proprietary, some of you may be curious for a few more details:

Offshore Compact files can be delivered from the LuckGrib server cluster via email or a direct low speed internet method:

In conclusion…

The LuckGrib Offshore Compact weather service is a premium offering of weather data to offshore sailors and other people who need weather data while working in remote settings.

If you are at all curious, download the application from the Apple App Store (on macOS or iOS), start your free trial and give it a whirl.



Copyright © 2019 Craig McPheeters. All rights reserved.