unless they are talking about a leica/mx marine unit. This is an active antenna and can output at 5Hz. This is too fast for a standard Hercules to do anything with (can take 1hz max from memory) but if you feed it straight into your computer (which may be tricky with a Racevision since its bluetooth feed comes straight from the B&G box), you can get improved accuracy espec around startlines etc when you are manouvering a lot.
Here is a GRIB.US view for 1200 UTC on Tuesday, and a snagged image from StormSurf for 00 UTC on Wednesday. Pick a spot where you think Joyon will punch into and out of the high in order to get to the westerlies associated with the low coming off of NA. Note, it's still pretty early but the models continue to show the high ooching east and flattening out at the same time...which is good thing.
just for your info, the models you are looking at are different plots off the same data - I'd be worried if they didn't show the same thing! Both are plots from the GFS model.