Restart the app and try again. Sometimes the app can't indentify all the devices that it has around it.

Restart the app again. Also, make sure your smartphone is compatible (see Hardware and Software compatibility). If the problem persists, please contact us at

When you finish the first turn to the device and the app does not mark the correct value, then you should do a second turn.

If the problem persists, you should cancel the calibration and restart the process. If you finish the turn and it has not added, you should add it automatically as explained in point 3.4 of the manual.  


TWA - True wind angle

AWA - Apparent wind angle

TWM - True wind module / True wind speed Roll - Heel angle Pitch - Tilt boat 

The "V" is really an "A" (upside-down) and it means "Apparent", and the "T" means "True".

You can change the variables and units shown in each display with a long press on the any of the four squares that appear on the main screen.  


Your gyroscope sensor is off by default for energy saving reasons. Please go to the menu and activate the "enable gyro" function. 


Sailing Anemotracker App will run on all type of iOS and Android devices. ULTRASONIC Portable will ONLY connect to smartphones and tablets with BLE chipset running Android(4.3, 4.4 or beyond) or iOS(iPhone 4s, iPad 3rd generation or beyond) using Sailing Anemotracker App.

Make sure your device has the correct version of Android or iOS.

First, open Settings on your device.

Scroll down and tap "About phone". If you don't see that option, hit System first.

Look for the "Android version" section of the page. The number listed in this section, e.g. 6.0.1, is the version of the Android OS your device is running.

If you have an Apple device, locate and open the Settings app. Tap General. Then, tap "About". Finally, look for "Version", and the number that is beside it is the information that you are looking for. 

Refer to the Anemotracker app on our website for further information.

Yes, ULTRASONIC will connect and will work fine with Anemotracker App with no internet connection.

However, you won't be able to use the Google Maps windows until you get access to the internet.

No. As any other bluetooth device, the communication is protected.

Once you pair your smartphone with your ULTRASONIC Portable unit, no other smartphone can communicate with it.

BT connection only allows connection with one device at the same time. So, if you are connected with your ULTRASONIC, your smartphone couldn't be connected with another device placed in another boat.

First of all uninstall and install again our app. If the problem continues, be sure to have installed the last firmware version. You can see how to in section "Firmware".