HURRICANE CENTER LOCATED NEAR 15.0N 48.3W AT 18/0300Z30 nautical miles (34.5 statute miles) is a pretty long stretch, but then the ocean is a big place.
POSITION ACCURATE WITHIN 30 NM [my emphasis: Z-Deb]
It isn't a big deal, because if you are actually in the vicinity of a tropical storm, there is never really any doubt where the eye is... generally speaking.
And you don't want to be 30 or 100 miles from the eye in any event. 12 foot seas are reported out 300 nautical miles from the center - that will ruin your day.