The best way to obtain a GRIB file is by using an approved Iridium GO! third party app. Iridium maintains a growing list of compatible third party apps here: https://www.iridium.com/IridiumApps.aspx. Please keep in mind that some apps may require a one-time fee or an ongoing monthly subscription. Roadpost will not provide any technical support for third party apps. Support will be provided by the app vendor.