@johnckealy said in Offline use ability: It sounds like people would gain enormous benefit just from GFS You know there are already several app using GFS files at sea. But people could prefer to get these files and visualize them on Windy with the same features and friendly UI as they have online. Sailors using GRIB files at sea get them via internet if they are close to the coast or via sat phone if they have this equipment and are offline. In the first case you can imagine using a cellular phone, a tablet or a laptop. In the second case a tablet or mostly a laptop. Then it can be connected to the NMEA equipment on board. Personally I use an iPad at sea, but no satellite connection. @johnckealy said in Offline use ability: but trickier to deal with raw GRIB files on a phone! This is possible. Try it with Squid Mobile which is a good and free app, both on iOS and Android. With Squid Mobile when offline you can also receive GRIB files via Iridium Go. These screenshots are from my iPhone, with GFS data, in Irish Sea and close to Dublin. When max zooming with GFS 0.25° (15 NM), here is the distance between wind barbs on your screen. @johnckealy said in Offline use ability: Really, the coolest solution would be for Windy to create a way to cache or save (in an offline Google Maps-type way) the maps on files on your device, If I understand you, this is the solution I propose: keep in memory some layers on a limited area?