During a passage
from St Marten & across the Pacific last year we used a great website which plotted your position on Google Earth & was developed by one of the CF members. We were the first ones to use it on a trans ocean passage
& it performed brilliantly getting our positions via SMS through our Iridium
BUT the downside is that he has now shutdown the site apparently due to lack of interest from the sailing community which is a real shame as it was great and could accept a lot of different inputs sources. The site was called bluewatersailingdata.com and his name is shown on the site.
Maybe if enough interest was generated he would consider reviving it but at this time I know he is cruising himself but I did speak with him via email recently.
This was by far the best free tracker that I have seen and I did a lot of research
prior to our passage & this one ticked all the boxes. As I said it's such a shame that it is not available now.