Marine Navigator by Ronald Koenig Notes: I have tried most of the other chart plotting apps on the Play Store and frankly can't recommend them. I consider the Navionics apps to be a poor substitute, but I have bought them in the past.
Salt Water Tides
Tide Chart FREE
Killer Whale Sighting Reporter
Marine Traffic Free
FlagBag 1.3 is a good app. Most of the sites on the internet have 1.4 versions, which have ads. Sorry! It is not on Google Play Store.
I have a couple that I have tried and ANCHOR WATCH is one I am still trying. However, I have worries about this sort of app. None of them appears to me to be adequately reliable. If you have a Garmin GPS with an anchor alarm, the whole device is devoted to the anchor alarm. But, an Android device with a app that checks to see if you have dragged is not completely devoted to your anchor watch.
I have built my own anchor alarm app and some day I may release it, but until I am convinced that it is utterly reliable I will have to keep testing it. Here is a list of issues that I see with an Android Anchor Alarm:
The anchor alarm is not the only app running.
It can be switched into the background, will become paused without your knowledge. It's not working!
If it becomes active again it may not have the original location and the GPS fix may not be reliable for some period of time.
Even if the app never becomes inactive, the GPS fix may become inaccurate to the point of danger. The app may not warn you.
If the battery is becoming low you may not get any warning that the device is about to shut down.
As you can see there is much to consider.
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