@svGina The same brought me to Othernet. You need to know, that you can only receive and not transmit any data with Othernet. There are grib files transmitted, but I don’t know if that happens at a certain time of the day. To receive the Othernet signal you need to point an LNB directly at the satellite at all time. As to your current position, I am not sure if the Othernet signal is strong enough on the Canary Islands and if you are planning to cross the Atlantic I am afraid you will be outside the satellite footprint when you need updates the most.
There is also another topic in this forum, called Outernet for sailors: Outernet for sailors (weather forecast grib files) There you should find some more informations.