Effective from 9 November 2026
This English version is the governing version (see Article 13).
1.1 These terms govern the contractual relationship between Colegio Solutions s.r.o., company ID (IČO) 24792161, with its registered office at Na Paloučku 21, 250 84 Sibřina, Czech Republic, registered in the Commercial Register maintained by the Municipal Court in Prague, file number C 174624, a VAT payer (the "Provider"), and the customer who orders the Lachez service for its event (the "Organiser"). Contact: info@lachez.eu.
1.2 The contract is concluded when the Organiser submits an order in the organiser console on lachez.eu after agreeing to these terms and the Provider accepts it. Acceptance means sending a proforma invoice (payment request) to the Organiser's e-mail address. These terms apply to Organisers who are businesses or associations; an Organiser who is a natural person not acting in business additionally has the rights of a consumer under applicable law.
1.3 Sign-in to the console is by a link sent to an e-mail address, without a password. The Organiser is responsible for keeping the mailbox that receives the sign-in link under its control.
2.1 For one event, the Provider makes available to the Organiser:
a) the console for setting up the event (basic details, areas and targets, programme, briefing, event card on the web, links);
b) links and QR codes for spectators, and a link and codes for pilots and crews;
c) a live event map for spectators and crews, and its embedding on the Organiser's website;
d) flight cards and track export in GPX format for flights in the event;
e) scoring of tasks (fly-in, distance, fox hunt), if the Organiser enables it;
f) an event card on lachez.eu with a permanent image of the tracks and a summary;
g) retention of the event's flights for 12 months after the event ends.
2.2 Package scope:
| Package | Number of balloons | Price excl. VAT (CZK) | Price excl. VAT (EUR) |
|---|---|---|---|
| Event S | up to 10 | 3,990 | 165 |
| Event M | 11–25 | 7,990 | 330 |
| Event L | 26–50 | 12,990 | 530 |
| Event XL | 51 or more | by agreement | by agreement |
A package covers an event of up to 7 days, an unlimited number of flights and waves, and all roles (pilot, crew, spectator) without further fees. Each additional event day beyond 7 days is charged extra (CZK 990 / €40).
2.3 Optional add-ons: permanent retention of all event flights (CZK 990 / €40 for each started year); event-day support (price on request, see Article 10.3).
2.4 Introductory discount: Organisers whose order is submitted by 31 March 2027 are entitled to a 30% discount on the package and add-on prices, for the first 5 orders in the order of submission. In return, they agree to the use of their name and logo in the Provider's references and to give brief feedback.
2.5 The number of balloons in a package is the upper limit of participation. If it is exceeded, the Provider and the Organiser will agree on a surcharge for a higher package. The fact that exceeding the limit does not show up in technical operation does not mean the Provider has agreed to it. The Organiser must report the number of balloons truthfully.
3.1 Prices are stated excluding VAT. VAT is determined by the Organiser's country and status:
a) Organiser in the Czech Republic: VAT 21%.
b) Organiser in another EU member state who is a taxable person and provides a VAT ID verified in the VIES system before submitting the order (VIES confirms it as valid): the supply is made under the reverse charge mechanism, without VAT; the customer accounts for the tax. The tax document states "VAT reverse charged – Article 196 of Directive 2006/112/EC" (Czech: "Daň odvede zákazník").
c) Organiser in the EU without a VAT ID verified before ordering (in particular a private person, or where verification did not take place): Czech VAT of 21% is charged.
d) Organiser outside the EU: the invoice is issued without VAT.
3.2 VAT ID verification. The VAT ID is verified in the VIES system before the order is submitted; an order with a VAT ID can be placed only after verification. If VIES is temporarily unavailable, the result of a verification of the same VAT ID from the last 7 days applies. The Organiser may also order without a VAT ID, with Czech VAT of 21%. If the VAT ID is verified only after such an order, we do not refund or recalculate the VAT.
3.3 Verification record. With the order we store the result of the VAT ID verification (valid/invalid), the date and time of verification, and the query identification number (the verification code issued by VIES) as evidence of the VAT treatment. We keep the record together with the invoice for 10 years (see the Privacy Policy).
3.4 Proforma invoice. After the order is submitted, the Provider sends a proforma invoice (payment request) in electronic form (PDF) to the Organiser's e-mail address. The proforma invoice is not a tax document. It is issued in CZK (to Organisers in the Czech Republic) or in EUR (to others). It is due 14 days after issue. Payment is by bank transfer; the proforma invoice carries a QR payment code. Payment is made when the amount is credited to the Provider's account.
3.5 Tax document. After the payment is credited to the Provider's account, we issue a tax document and send it by e-mail. The date of the taxable supply is the day the payment is credited. If the tax document is in EUR, the VAT on it is also stated in CZK at the exchange rate of the Czech National Bank valid on the date of the taxable supply.
3.6 The Organiser is responsible for the accuracy of the billing details (name, address, company ID, VAT ID, country). Incorrect details must be corrected no later than before payment; until payment we reissue the proforma invoice, and after a tax document has been issued we make corrections by a corrective tax document and a new tax document.
3.7 The price list applicable to an order is the one displayed when the order was submitted. The Provider may change prices for new orders; an already ordered service is not affected.
4.1 After the order is submitted, the Organiser may continue preparing the event in the console, view a preview, publish the event card on the web and share links with spectators.
4.2 The Provider makes the pilot code and crew codes for sharing position from the Lachez mobile app available only after payment is confirmed, usually within 2 working days of the payment being credited. Until then, the app does not accept sharing for the event.
4.3 The Provider confirms payment manually and informs the Organiser by e-mail when the codes are made available.
4.4 The Provider does not guarantee that payment will be confirmed and codes made available earlier than 2 working days before the event starts, if the Organiser pays later than 2 working days before the start. We recommend ordering and paying at least a week before the event.
5.1 The Organiser undertakes to:
a) provide truthful information about the event and itself, and hold the rights to the logos, texts and materials it uploads to the console;
b) inform pilots and crews that the position of their balloon / vehicle is shared during the event and that tracks and results may be public depending on the event card settings; this is done in the event rules or the briefing;
c) not share the pilot code and crew codes outside the circle of event participants;
d) not use the service in a way that is contrary to the law, endangers air traffic safety or disrupts the operation of the service;
e) at a pilot's request, hide the display of altitude and speed of the pilot's flight, or delete the flight (in line with the Privacy Policy).
5.2 The Organiser is responsible for the organisation and safety of the event and for compliance with aviation rules and instructions of the authorities. The decision on a flight is always made by the pilot.
6.1 Lachez is a tracking and planning aid, not flight supervision and not a source of official aeronautical information. Data on airspace, obstacles (wires), NOTAMs, AIP, weather and positions may be incomplete, delayed or inaccurate. The pilot must obtain and verify official information and is responsible for a safe flight.
6.2 The service is provided "as is", without a guarantee of uninterrupted availability. The Provider will use reasonable efforts to make the service work during the event; it is not liable for outages caused by third parties (mobile network, GPS, map data, hosting, app stores) or for position being unavailable because of pilots' phone settings.
6.3 The Provider is not liable for damage to health or property or any other harm arising in connection with a flight or the event, nor for consequential damage and lost profit, except where liability cannot be excluded (intent, gross negligence, personal injury caused by a breach of the Provider's duty). The Provider's total liability to the Organiser is limited to the price paid for the relevant event.
6.4 Airspace data is based on public sources, in particular openAIP.
7.1 The service processes positions of balloons and crew vehicles shared by pilots and crews from the Lachez app for as long as they themselves turn sharing on. The scope, purpose, legal basis and retention periods are described in the Privacy Policy on lachez.eu, which forms part of these terms.
7.2 Roles of the parties: The Provider is the controller of the position data of pilots and crews (see the Privacy Policy, §1). The Organiser is a recipient of the data on the flights of its event (flight list, tracks, GPX) and is a controller in its own right for their further use (publishing results, scoring a competition). The Organiser must not use the flight data for purposes other than organising and scoring the event, and must not pass it to third parties without a legal basis.
7.3 Retention periods: flights are kept for 90 days; flights of an event for which the Organiser has enabled retention, for 12 months after the event ends; permanently only flights expressly marked for retention by the pilot or the Organiser, and the anonymous image of tracks (see the Privacy Policy, §6). After the period expires, the data is deleted.
7.4 The Organiser is responsible for ensuring that pilots and crews are informed that tracks and named results are shown publicly on the event card.
7.5 The Organiser's account data (e-mail, name, billing details, IP address for abuse protection) is processed under the separate section of the Privacy Policy for organisers.
8.1 The Lachez platform, the mobile apps, the website, the graphics and the databases are protected by the Provider's rights. The Organiser receives a non-exclusive, non-transferable right to use the service for the duration of the event and the retention period.
8.2 The Organiser grants the Provider a non-exclusive, royalty-free right to use the logo, the event name and uploaded materials to the extent necessary to provide the service (display in the console, on the event card, in the map, in outputs).
8.3 Consent to use the Organiser's name and logo in the Provider's references (and for the introductory discount under Article 2.4) may be given separately; after the discount ends it can be withdrawn.
8.4 The Organiser may freely use the generated outputs (flight cards, GPX, track images) to promote and document its event.
9.1 The contract is concluded for the period from the submission of the order until the end of the retention period under Article 2.1(g).
9.2 Cancellation before payment: the order may be cancelled by e-mail free of charge until the payment is credited. The proforma invoice is simply marked as cancelled; no corrective document is issued, because no tax document has yet been created.
9.3 Cancellation after payment: if the Organiser cancels the event at least 14 days before it starts, we refund the price paid less 10% as compensation for costs; if cancelled later, the price is not refunded. We refund to the account from which the payment was received and document the refund by a corrective tax document. The Organiser is entitled to a one-time free transfer of the paid service to a new event date (within 12 months of the original date).
9.4 The Provider may withdraw from the contract if the Organiser seriously breaches these terms (in particular misuses the codes, provides false information or endangers safety); in that case the price paid is refunded proportionally.
10.1 The Organiser reports defects in the service without undue delay to info@lachez.eu, with a description and the time of occurrence.
10.2 The Provider assesses the complaint and usually replies within 5 working days; it remedies the defect within a reasonable time or grants a price reduction corresponding to the extent of the defect. If the defect cannot be remedied, the contract may be withdrawn from, with a proportional refund of the price.
10.3 Support during the event is provided by e-mail on working days; a guaranteed response time at weekends is not part of packages S–L. The Provider offers event-day support (including weekends) as the add-on "Event-day support"; the price on request and the agreed scope (hours, contact) are stated in the confirmation of the add-on.
11.1 The Provider may change these terms; for orders already concluded, the version valid at the time of the order applies. The current version is available on lachez.eu.
11.2 Communication is by e-mail to the addresses stated in the console and to info@lachez.eu. A message is deemed delivered when sent to the stated address.
12.1 The contract is governed by the law of the Czech Republic. Disputes are decided by the court with subject-matter and local jurisdiction in the Czech Republic according to the Provider's registered office.
12.2 Provisions of law that cannot be derogated from by contract prevail over these terms.
12.3 These terms are made in Czech and English. The English version governs interpretation (see Article 13).
12.4 These terms take effect on the day they are published on lachez.eu, that is on 9 November 2026.
13.1 The English version always prevails for these terms, the Privacy Policy and the texts in the Lachez app and on the lachez.eu website.
13.2 Versions in other languages (including Czech, German, Slovak, Polish, French, Italian, Spanish and Turkish) are translations for the information and convenience of the user; in case of conflict, the English version prevails.
13.3 The Privacy Policy and the licence terms are available only in Czech and English; other language versions are not prepared.
13.4 Translations have not been checked by a native speaker; the Provider is not liable for them beyond a faithful rendering of the English version.
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