Bob’s been chasing this subject, and I’ve been doing a little research on it as well. The standard seems to be the (expensive) MaxSea Navigator Pro, the alternative software (cheaper) appears to be Fugawi:
http://www.fugawi.com/web/products/fugawi_marine_enc.htm
We do not currently have the capabilities of getting GRIB files via email (when they say GRIB via SSB, they mean GRIB via Pactor-based email over SSB, I think). However, there has been some talk around the campfire about getting a satellite phone, which would give us the capacity to get these files. If Fugawi would be as useful as MaxSea, then the difference in price may make the Iridium phone achievable.
For reference, here is a good article on weatherfax “alternatives”:
http://www.marinecomputer.com/articles/onav/beyondweatherfax.html
And here is a good background article on GRIB files:
http://www.franksingleton.clara.net/grib.html
I’d get the phone.
Yep, we did. We actually used one in the coastal cup and it works, well, just like a phone.