Other helpful apps that I run,
windAlert and Anchors Aweigh
windAlert is weather/wind info based on SailFlow.com data.
Anchors Aweigh is a great little drift/anchor alarm.
Disclaimer: my friend wrote Anchors Aweigh. I am not associated with his company, and do not make any money from the app.
USCG Master 100T
S/V Priorities (79' CAL 31)