Sailsafe. Anchor alarm.

233 reviews
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About this app

Sailsafe is an application designed to increase safety in the anchoring of small and medium-sized ships.

It lets you stablish a safety zone around your anchor and activate an alarm that will alert you in case your ship leaves that zone at any given time (very common situation when anchor drifting occurs or the chain breaks). You will be able to see where the boat is located on the map at any moment, which is very useful if it is dark or visibility is reduced.

The safety zone can be set just indicating a radius.

In PRO version, you can also specify an aditional exclusion zone to detect, for example, changes in wind direction that could put our boat at risk if, for example, the coast is positioned itself to leeward.

Sailsafe has been designed to maximize the safety after anchoring. Therefore, once the alarm is activated, not only the position of the ship is checked, but also the level of the battery in the mobile device or the state of the GPS signal. If any of these parameters fails, then the app will produce an audible alarm to inform about the specific problem. Thus, after setting the alarm you can relax and trust Sailsafe. It will be watching for you.

IMPORTANT: Recent Android versions may stop the alarm when the device is idle (screen off) to save battery. To avoid this, go to battery settings and, at the end, add Sailsafe to the unmonitored apps list (this option might change depending on the Android version). Also check that you are not using any battery saving mode in your device.

- It runs in the background.
- Main screen shows useful information:
1. Current position (latitude, longitude and accuracy of the measure).
2. Current security radius.
3. Current drift.
- Set graphically and easily a security zone with an optional exclusion zone.
- Wind forecast included (48h). You will be warned if the boat is expected to be out of the security zone due to a wind change.
- The ship and the security zone are always shown over a map with optional satellite view.
- Once the alarm is set, you can adjust the anchor position in case it is not correct. Just indicate the actual bearing (read it from the compass) and estimated distance between the ship and the anchor (surface distance).
- Option to ignore the current volume of the device and set it to the max when the alarm is triggered.
- Option to set a minimum battery level. When reached, the alarm is triggered.
- Option to allow automatic alarm re-launch after a false positive.
- Option to keep the screen on while the alarm is activated.
- Option to call a phone number when the alarm is triggered.
- Remote commands:
1. An incoming call from a defined phone will reset the alarm.
- After a set number of seconds without GPS signal, the alarm is triggered.
- Option to mute alarm tone after a set number of minutes (to avoid annoying pets in the boat if the alarm is triggered and nobody is on board).
- Option to set the measurement unit (feet or meters).
- Three modes of operation:
1. Normal. GPS readings every 10 seconds. Simple algorithm to discard odd positions. (Save battery when the device is not charging).
2. Fine. GPS readings every 2 seconds. Complex averaging algorithm based on accuracy and time of the last 10 GPS readings to discard odd positions making the whole system smooth and robust. More power consumption.
3. Continuous. GPS readings every 1 second. Same algorithm as in fine mode. Optimus for adverse weather conditions. More power consumption.
4. Poor GPS signal mode.
- When re-enabling alarm, if ship moved less than 150 meters, you can opt between keeping last anchor position (useful after a false alarm) or using the actual GPS reading.
Updated on
Apr 3, 2019

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233 reviews
A Google user
October 8, 2019
I like the UI of these app a lot, really like the map view. Unfortunately, it goes off all the time for no apparent reason. I'm using two other anchor alarms in two other phones with no problems going off. I do like this one the best but it just not reliable. And I don't like waking up for false alarms.
10 people found this review helpful
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A Google user
January 2, 2019
Won't allow you to input coordinates manually. I get the anchor position prerry accurately by looking at my GPS tracks on my chart plotter and setting a waypoint. I can see exactly where I stopped and started backing up, laying chain until I set it. If I have to play games guessing distances and headings this app is worthless to me. let me input my own coordinates like Dragqueen used to.
2 people found this review helpful
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A Google user
May 30, 2019
This app has been very well thought out and allows you to input the anchor offset. (useful of you don't set the position immediately after dropping the anchor.). Also there is a low battery alarm. The only minor issue was is that it is a little bit easy to cancel the set position set if playing around on the phone. (I suggest a warning - "are you sure") The alarm has 3 sound options. A recording or voice option would be nice to have so you can state "Anchor alarm!". Great app. Thanks.
19 people found this review helpful
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What's new

SMS remote commands disabled. Google no longer permit this option!