I have tried a few, and can thoroughly recommend Software on Board from
Digiboat. I have been using it properly all the 2010 European season on a Samsung Netbook which is so
power efficient that it can be left on all the time for coastal sailing, even on quite long passages. That way it
logs position, course speed and
wind continuously in a form that can be used in your Log, or processed using Excel into graphs etc.
A description of the
installation is on my website. Click
Here to go there.
My first full Log using the system (covering a
cruise from the Solent to Biscay
France, and a visit to the Corduan lighthouse on the Gironde) can be seen by
clicking here . This Link takes you to the summary page. The next link to the full Log (which is 60Mb as a pdf) takes time to load, so you really need a good
broadband connection to go there.