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Last updated: 6 September 2026
Vadum Privacy
This page describes what the Vadum app (iPhone, iPad, Mac) does with data. Vadum is a pre-flight weather briefing for private pilots in Switzerland. It is free, there is nothing to buy, there is no advertising and there is no bimover account.
Vadum does not fetch the weather from a source of its own. It signs in to your account at www.skybriefing.com on your behalf, in a web view that stays out of sight, and reads the pages. You therefore need your own account there, which costs nothing. Everything below follows from that one fact.
Vadum is not an official flight preparation. It replaces neither the official briefing nor the responsibility that rests with the pilot in command.
For bimover’s website and account services, see the general Privacy Policy.
1. Controller and contact
bimover GmbH, Hammer 19, 5000 Aarau, Switzerland. UID CHE-132.862.302. Email: privacy@bimover.ch
bimover is the controller for the app itself. bimover is not the controller for your account at skybriefing.com. That account belongs to the operator of skybriefing.com, as set out under point 3.
2. What reaches bimover: nothing
Vadum has no analytics, no telemetry, no crash reporting, no advertising identifier and no bimover account. There is no bimover server that the app talks to, so there is nothing on our side to receive, store or pass on. The app carries no third-party packages: its two Swift packages declare no external dependency, and the shared core has no network dependency at all.
The app does store things, and points 4 and 6 say exactly what. None of it goes anywhere near us. Everything the app sends goes to skybriefing.com, because that is the service you are asking it to operate.
Two things belong next to that sentence.
A diagnostic line on the device. When the app fails to read a page it expected, it writes one line to the device’s own system log, naming the step that failed and the address of the page it was on. That line stays on your device. It is not sent anywhere, and we can only see it if you sit at your own machine and read the log.
Apple’s own figures. Because bimover publishes the app on the App Store, Apple makes crash reports and anonymous usage statistics available to us, unless you have switched that off on your device. We did not build it in and we cannot recognise you in it. You switch it off under Settings, Privacy and Security, Analytics and Improvements.
3. The account belongs to skybriefing.com
You create the account at www.skybriefing.com, you manage it there, and you delete it there. bimover cannot create, change or close it for you.
Your flight plans, your briefing history and everything else stored under that account live on their systems, not on ours. bimover is not the controller for them. What happens to that data is governed by the privacy policy of skybriefing.com, and your rights in it are exercised against them.
Vadum is an independent app published by bimover GmbH. It is not made, commissioned, endorsed or reviewed by the operator of skybriefing.com, and bimover has no arrangement with them beyond being one of their users.
4. The credentials the app keeps
Your password goes into the keychain of your device, filed as an internet
password for the server www.skybriefing.com, with your email address as the
account name.
On iPhone and iPad that is the protected store of the system. The entry can be read only after the device has been unlocked at least once since it was switched on, it belongs to this app, and other apps do not get at it by themselves. On a Mac it goes into the login keychain, the way a website password does: you can see the entry in Keychain Access, and another program can ask for it, in which case the system asks you first.
It is not marked for synchronisation, so it does not travel to your other devices through the iCloud keychain. If you make an encrypted backup of your device, the entry is part of that backup and comes back on a restored device.
The app reads it in two situations: when you start it, and when your session at skybriefing.com has expired and it needs to sign in again quietly. In both cases the password goes to one place, the sign-in form at skybriefing.com. It never reaches bimover. If a stored sign-in is rejected, the app deletes it by itself and asks you again.
Your email address is kept in the app’s own settings in the clear, under
the key skybriefing.email. It is not encrypted. It is there for two reasons:
so the sign-in field is already filled in, and so the app can tell on launch
whether an account has been set up at all. It is not a second copy of your
password, but it is readable by anything that can read the app’s settings,
which is a lower level of protection than the keychain, and you should know
that.
Getting rid of all of it. In the app, use Sign out. That deletes the password from the keychain, deletes the stored email address, and removes the cookies and stored website data of skybriefing.com from the device. Deleting the app removes its settings and everything it had loaded. Your account at skybriefing.com is untouched by either. Only you can close it, and only there.
5. The app operates the provider’s website on your behalf
Vadum has no private channel to skybriefing.com. It loads the ordinary pages of that website in a web view that is kept out of sight and out of reach, and reads the values out of them. In effect, the app clicks through the site the way you would.
One host, and no other. Every network address in the app points at
www.skybriefing.com. There is no second host, no content delivery network and
no measurement service.
The session stays on the device. The session cookies that skybriefing.com sets go into the app’s own website data store on your device. They are not Safari’s cookies, and other apps do not get at them by themselves. They persist across launches, which is why you sign in once rather than every time.
Every request carries your IP address. Signing in, loading your flight plan
list, ordering a briefing, fetching a chart and fetching the DABS document all
go to www.skybriefing.com and carry what any HTTPS request carries: your IP
address, the time, and which page was asked for. skybriefing.com is the
recipient. bimover receives none of it and keeps no copy.
The DABS is fetched separately. The daily airspace bulletin is fetched as a PDF over an ordinary connection, without the web view and without your sign-in. The system’s own HTTP cache may keep a copy of that file on the device. Signing out does not clear it. Deleting the app does.
6. What stays on the device, and for how long
- The password, in the keychain, until you sign out.
- The email address, in the app’s settings, under
skybriefing.email, until you sign out. - Which weather products you want and in what order, in the app’s
settings, under
enabledProducts.v1andproductOrder.v1. This is a list of chart names and holds nothing personal. - Session cookies and the website data of skybriefing.com, in the app’s own store, until you sign out.
- The DABS document of the day, possibly in the system’s own HTTP cache. Deleting the app removes it.
- A diagnostic line in the system log when a read fails, as described under point 2. The system ages it out on its own.
What the app has loaded, meaning the briefing text, the charts, the DABS pages and your flight plan list, is held in memory only. Beyond the six items above the app writes nothing to disk. Quit it and what you were reading is gone; the next launch fetches it again. Without a network you are left with the sample briefing that ships inside the app.
None of this is uploaded anywhere by the app. There is no backup on our side and no copy on our side, because there is no side of ours for it to be on.
7. Flight data is personal data
When you ask Vadum for a new route briefing, these entries are typed into the form at skybriefing.com on your behalf and sent there:
- flight rules, VFR or IFR
- departure aerodrome
- destination aerodrome
- alternate aerodrome, where you enter one
- date and off-block time, in UTC
- estimated time en route
- lowest and highest flight level
- the width of the corridor around the route
- the route itself, where you enter one
Your flight plans at skybriefing.com also carry your callsign, and the app shows it in the list so you can tell one plan from another. That callsign reaches the app from skybriefing.com and goes nowhere else.
The callsign is the sensitive part of it. It is held in the national aircraft register, and that register can be looked up, so a callsign leads to an aircraft and from there to the person who keeps or owns it. Put next to a departure time, a route and a date, it stops being a technical identifier and becomes a record of where a particular person was, and when. The rest of the list is the same kind of information in a weaker form.
All of it goes to skybriefing.com, because that is where the briefing is produced. None of it goes to bimover. What happens to it after it arrives there is governed by their privacy policy, and bimover is not the controller for it.
Vadum orders a weather and NOTAM briefing. It does not file a flight plan.
8. The sample briefing
Before you have set up an account, Vadum shows a sample briefing that ships inside the app. In that state it does not touch the network at all: no request leaves the device. The sample has a fixed issue time that never changes, and the app says so above it. It is there to try the app out, not to prepare a flight.
9. Children
Vadum is aimed at pilots and is not directed at children. It collects nothing from anyone for bimover. Using it for real weather requires an account at skybriefing.com, which is not ours to give out.
10. Your rights
Under the Swiss Federal Act on Data Protection and, where it applies, the GDPR, you have the right to information about your data, to correction, to deletion, to restriction, to receive it and have it transferred, and to object.
Since no personal data from Vadum reaches bimover, we hold nothing to disclose, correct or delete. You are still welcome to ask, and we will answer: bimover GmbH, Hammer 19, 5000 Aarau, Switzerland, privacy@bimover.ch. If you are in Switzerland you may complain to the Federal Data Protection and Information Commissioner. In the EU, to your national supervisory authority.
For the data held under your account, address skybriefing.com. They are the controller for it, and only they can produce, correct or delete it.