FAQ – SailTimer Air Link 4™

What link for the Air Link app in the App Store on Android/iOS?

You can download the Air Link app from your app store to set up the Air Link. After setting up the Air Link, you can close the app and you should rarely need to use it again. The Air Link will reconnect automatically when it is turned on again.

Android app store: https://play.google.com/store/apps/details?id=com.sailtimer.airlinkapp

iOS app store: https://apps.apple.com/ca/app/air-link/id6469375299

Does the Air Link 4 require GPS?

Yes, GPS data must be available from NMEA wiring (2000 or 0183), e.g. from your GPS chartplotter or a lower-cost GPS mushroom antenna. The Air Link uses GPS data for calculations such as from Apparent to True wind speed/direction/angle. It also uses GPS data to convert from wind direction in Magnetic North to True North.

For GPS data to the Air Link, what NMEA 0183 sentences can it receive?

For GPS data, the Air Link 4 currently receives the NMEA 0183 sentences RMC, HDT and HDM.

What is the Air Link app for, on Android and iOS?

The Air Link has LEDs for wifi, Bluetooth, NMEA 2000 and 0183, to provide feedback on processing and connections. But since it does not have a display screen, the free Air Link app on Android and iOS lets you easily configure functions like your connection to wifi and the internet, or connect the Air Link to your Wind Instrument.

Is there a tutorial showing how to use the Air Link app to configure my Air Link 4?

Yes, there is a 2-minute YouTube tutorial at https://www.youtube.com/watch?v=er_rDp_C3Xo

After configuring the Air Link with the app, do I need to keep the app running on my phone/tablet?

No, you can close the app or even shut off the phone/tablet. The app is only needed briefly to configure your Air Link 4 with wifi or with a Wind Instrument on Bluetooth.

What connector is on the underside of the circuit board, in case I want to remove (or connect) the included NMEA 0183 wire bundle?

On this photo, you can see the green screw terminals for NMEA 0183 and 2000. Although it is fine to open the case and remove the NMEA 0183 wires, the wiring bundle could also simply be cut off where it enters the case. The 0183 wires are dead anyways if not connected to anything. That keeps the hole blocked, to keep moist air out.

Note that the color code for the NMEA 0183 wires is printed on the outside of the Air Link case, in case you need to reconnect them in future.

Why is crowdsourced weather better than the usual weather forecast?

Crowdsourced data is based on actual measurements, unlike satellite weather imaging. This gives much higher resolution than standard marine weather forecasts. With crowdsourced wind maps, we archive data in coastal areas to know exactly how the wind flows around a headland or funnels into a harbor when the wind on the open water is e.g. from the West. Then if the wind will be from the West in a new forecast, you can navigate knowing e.g. that it actually changes to a different direction entering the harbor. This crowdsourced data can have resolution in 10-meter cells, which is unheard of for estimates from satellites.

In traditional navigation, you can only get precise wind data from your wind sensor. No-one would ever set their sails based on the weather forecast. But with crowdsourced data, your wind sensor can tell you the wind around your boat, and the crowdsourced wind map can tell you what the wind is doing up ahead or around the next point.

Are there privacy issues when crowdsourcing marine weather?

No, you can register with a boat name or any identifier you want when registering to use the SailTimer Air Link and app. There are no credit card numbers, private data or demographics involved; actual measurements of marine weather are sent anonynmously to our server, to improve navigation for everyone. This may also give you the option to check weather conditions at your boat when you are at home, or for viewing races from shore, or for safety if you want someone on shore to know where you are.

When sharing weather data from the Air Link, there are no privacy violations and no attempt to gather other information about you for advertising. You should simply expect that data is shared to improve and validate weather maps. A public service that you can feel good about contributing to. No agency ever has enough weather stations — but crowdsourcing solves this problem. Even in areas with few users, they move around a waterway or coastline all season long documenting how the wind flows and validating weather forecasts.

The Air Link 4 is designed to be low-cost, so that lots of people can use it, which provides better weather maps for the entire boating community. It is possible to turn the crowdsourcing off in the Air Link app, but there is really no benefit to that. The data is just a few numbers in text format that are very low bandwidth. So we encourage you to leave it turned on for the public good.

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