What is reChain Grib?
reChain Grib is a small, focused iOS utility designed for offshore sailors using a Garmin inReach. The app helps you:
- Create precise GRIB weather requests.
- Decode GRIB chunks received by email on your inReach.
- Export the final GRIB file to any GRIB viewer.
The app works entirely offline once installed and does not require any account, login, or subscription.
Key Features
-
GRIB Request Builder
Define your forecast area, parameters and period, then copy a clean GRIB request that you can send via your Garmin inReach. -
GRIB Decoder
Paste the GRIB chunks you receive by email on your inReach, and reChain Grib will reconstruct and decode the file for you. -
Step-by-step Tutorial
A built-in tutorial explains the full workflow, from drafting the GRIB request to opening the decoded file in a GRIB viewer. -
Offline-first, Lightweight
Designed for low-bandwidth and offshore use. No login, no cloud account, and no data upload. -
Completely Free
reChain Grib does not include in-app purchases or subscriptions and does not unlock any paid features from outside the app.
How it Works (Overview)
- Use the Request view to define your GRIB area and parameters.
- Copy the generated request and send it via your inReach to a specific email address.
- When the GRIB reply arrives as multiple text chunks, share or copy them into the Decoder view.
- reChain Grib rebuilds and decodes the GRIB file.
- Open the exported file in your preferred GRIB viewer app.
Privacy & Location Use
reChain Grib uses your location only to center the GRIB request map around your current position when you are defining the forecast area in the Requester view.
Your location is used only while the app is in use, is not stored on our servers, and is never shared with third parties.
Support
If you have any questions or encounter an issue with the app, you can contact the developer by email: jclevenne@jcskipper.com.