Effective 9 August 2026
These terms govern your use of ExtrmSport. Clause 4 is the one that matters most: the calculators are planning aids, and nothing they produce overrides your rigger, your instructor or your manufacturer's data.
ExtrmSport is operated by MAVERICKX PTE. LTD., a company incorporated in Singapore. In these terms, "we", "us" and "our" mean that company, and "you" means anyone using the service.
These terms apply to all three parts of ExtrmSport:
If we enter into a separate written agreement with you, that agreement prevails over these terms to the extent of any inconsistency. Nothing on the service creates a partnership, a joint venture, or an agency between us.
By using ExtrmSport you accept these terms. If you do not accept them, please stop using it. We recommend you read them before relying on anything published here.
The calculators are planning aids. They are not an airworthiness determination, not a currency determination, and not permission to jump. Your canopy and container manufacturer's published data, your rigger, your instructor, your dropzone's rules and your national body's regulations govern — and every one of them overrides anything this service outputs.
The calculators apply general formulae to the figures you type in. They do not know your equipment, your jurisdiction, your experience, the condition of your gear or the conditions on the day. A repack interval differs between jurisdictions and changes when the rules change. A currency requirement differs between national bodies and between licence classes. A wingload figure that is unremarkable for one jumper is dangerous for another.
We give no warranty that any figure produced is accurate, current or applicable to your equipment or your jurisdiction. You are responsible for verifying any number against an authoritative source before you act on it, and for not acting on one you have not verified. If a calculator and your rigger disagree, your rigger is right.
A reminder is a convenience, not a guarantee. We do not undertake that a reminder will arrive, arrive on time, or arrive at all, and a missed reminder does not extend a repack cycle or preserve currency. Keeping your gear in date is yours to do.
Skydiving carries a risk of serious injury and death that no software reduces.
Some features need an account. When you create one, give us accurate details and keep them up to date. You are responsible for your credentials and for what is done through your account; tell us promptly if you believe someone else has access to it.
You may close your account at any time. We may suspend or close an account if you break these terms, if we are required to by law, or if an account is being used in a way that puts the service or other users at risk. Where it is reasonable to do so, we will tell you first and give you a chance to put it right.
You may use ExtrmSport for your own jumping and for the internal purposes of your dropzone, club or business, and you may view, download and print pages for reference, provided you do not remove any notice of ownership.
You do not need our permission to link to us, provided the link is not misleading and does not falsely imply endorsement or approval by us.
You must not:
Dropzone listings and community posts are yours. You keep whatever rights you have in them. By submitting one you give us a non-exclusive, worldwide, royalty-free licence to store, display and distribute it as part of the service, and to keep the copies a backup and a search index necessarily involve. That licence exists so we can show your listing to the people you posted it for, and it ends when the content is removed, save for backups that expire on their own cycle.
You warrant that, for anything you submit:
We do not review what you post before it appears, and what you post is yours, not ours — it does not represent our views. We may remove or edit content that breaks these terms or the community guidelines, but we are under no obligation to monitor for it, and not removing something is not our endorsement of it. Safety advice from another user is that user's advice, not ours.
The service links to websites operated by others, and dropzone listings point at dropzones we do not run. We provide those links for reference. We do not control those sites or those businesses, we are not responsible for their content, availability, safety practices or privacy practices, and a link or a listing is not an endorsement or a recommendation. Dealing with them is at your own risk and on their terms.
Some features require a paid plan. Payment is by bank transfer; we do not take card payments. Access to a paid feature begins when we have received payment and continues for the period paid for.
Prices are as published at the time you subscribe. We may change them, but a change does not affect a period you have already paid for. If you want a refund, write to us and we will deal with the request reasonably and in line with Singapore law; we will publish fuller refund terms on this page when the billing terms are settled.
Unless stated otherwise, we or our licensors own the copyright and all other intellectual property rights in the service, including its text, layout, graphics, the calculators, and the ExtrmSport name and marks. All such rights are reserved. Clause 8 covers content you submit, which this clause does not claim.
Using the service gives you no ownership of anything in it, and no right to use our name or logo, which require our written permission.
Everything on the service is general information. It is not professional, technical, medical, financial or legal advice, and it is not instruction — instruction comes from a qualified instructor, in person. You should not act on anything here without taking advice suited to your circumstances.
We take care over what we publish, but to the extent the law allows we give no warranty that the service or its content is accurate, complete or current, or that it will be available without interruption or free of errors. Clause 4 applies in particular to the calculators.
Nothing in these terms limits or excludes our liability for death or personal injury caused by our negligence, for fraud or fraudulent misrepresentation, or for anything else that cannot lawfully be limited or excluded. Any other provision of these terms is read subject to this paragraph.
Subject to that, and to the extent permitted by law, we are not liable for any loss of profit, loss of revenue, loss of business, loss of anticipated savings, loss or corruption of data, or any indirect or consequential loss, arising out of your use of the service or your reliance on anything published on it.
The public site and the calculators are free to access and we receive nothing for them. Having regard to that, to the fact that they publish general information rather than performing any function you may depend on, and to the verification obligation in clause 4, we consider these limits fair and reasonable within the meaning of the Unfair Contract Terms Act 1977 of Singapore. Where you pay us for a plan, nothing in this clause is intended to limit our liability below what that Act permits for a paid service.
If you break these terms or use the service unlawfully, you will be responsible for any loss, damage, cost or expense we reasonably incur as a direct result, including reasonable legal costs. This includes a claim brought against us because of something you published. It does not apply to anything caused by our own act or omission.
We may change, suspend or withdraw the service, or any part of it. Where a change would materially reduce a paid feature you are currently paying for, we will give you reasonable notice. We are not obliged to keep any content available or up to date.
We may also change these terms. The version published on this page applies to your use of the service, and the effective date at the top tells you when it was last changed. Continuing to use the service after a change means you accept the revised terms, so please check this page from time to time.
A person who is not a party to these terms has no right under the Contracts (Rights of Third Parties) Act 2001 to enforce any of them.
If any provision of these terms is found to be unenforceable, that provision is severed and the rest continues to apply. If we do not enforce a right under these terms, that is not a waiver of it, and we may still enforce it later. These terms, together with our Privacy Policy and any posting guidelines published on the community forum, are the entire agreement between us about your use of the service.
These terms, and any dispute or claim arising out of or in connection with them or with your use of the service, are governed by the laws of Singapore. You and we submit to the exclusive jurisdiction of the courts of Singapore.
We make no representation that the service is appropriate or available for use outside Singapore. If you access it from elsewhere, you do so on your own initiative and are responsible for complying with the law where you are — including, in particular, the aviation and parachuting rules that apply to you rather than the ones assumed by any figure this service produces.
How we handle personal data, including the cookies we set, is explained in our Privacy Policy, which forms part of these terms.
General questions about the service are best asked at community.extrmsport.com. Formal notices, and anything about these terms or your personal data, go to our Data Protection Officer:
Data Protection Officer