I do not believe it is specifically an iPad problem, but rather, it has something to do with the gps accuracy the military "allows" us to have. I have used several laptops with various chart software
, several different USB pucks, and now the iPad. In all cases, there are situations where positional accuracy is not as close as we would like ...... sometimes within 10', and sometimes 30'+ . It varies from chart to chart, and from day to day.
It is still much better than my old RDF radio
device (remember those?!) and my King Loran
We all use discretion with gps and electronic charts
anyway, no? Just don't rely on your gps to allow you to pass two feet on the safe side of that shoal in fog
or at night. (or anytime, for that matter!)
So, a positional accuracy of +/- 50' is something I can live with ....... it does not make the iPad any less useful to me. (best piece of technology I have had in my hands since the earth started to cool!)
There, my bias is showing.