I will be moving my boat from Alameda in the SF Bay to Stockton in about two weeks. It's going to be a fun 80 mile sail. I would like to be able to track and monitor my location on my android phone. This would be helpful especially in the delta where one wrong turn can get you either lost or aground. I have the charts but an actual location would be helpful as well. Any recommendations on apps that people have tried liked and disliked