![]() ![]() ![]() "The more satellites in view, the more accurate and reliable is the location that you can obtain - generally to within 20 metres in all three dimensions." The distances from at least three 'landmarks' are needed, and when these intersect they give your location. "It then uses a process called trilateration to work out its location. ![]() "The device receives signals from the satellites and calculates the distance to each satellite," says Feng. The satellites' orbits are arranged so that, at any time, there are at least four satellites above the horizon anywhere in the world. "In the case of GPS, the landmarks are very tall - satellites moving across the sky, orbiting about 20,000 kilometres above the Earth."įeng says there are currently about 31 active GPS satellites in the system maintained by the US Air Force, which anyone with a GPS device can receive signals from. "GPS navigation works in a similar way to someone using a prominent landmark like a tall building or a hill to get their bearings," says Dr Yanming Feng, a specialist in satellite systems and positioning technologies at Queensland University of Technology. The devices make use of the Global Positioning System (GPS), which is a system of satellites maintained by the United States. These phones contain a GPS receiver, similar to the ones you can buy for your car. If you are happy with our app we would be grateful if you would take a moment of your time to post a rating/ write a review in the App Store.If you've ever been walking in an unfamiliar city and got lost in a maze of streets, you'd appreciate having a mobile with GPS to let you know exactly where you are. You can add the following additional modules to your app (charges apply) It comprises a total of four modules including “iGolfrules” – one of the world’s most popular sport apps that has been in the App Store top ten continually for many years and is officially recommended by Apple. Providers that only charge a once-only payment for their app will sooner or later stop maintaining their data.Įxpert Golf is the only app that puts everything a player needs during a round of golf onto the iPhone. Only with an annual fee concept will you be guaranteed access to up-to-date and comprehensive data that you can trust on a long-term basis. This means that the database has to be constantly maintained and updated. BUY EXPERT GPS DOWNLOADYou can continue to use the app without renewing the service, you will just no longer be able to download any new courses from the database.)įAQ – Why Expert Golf charges an annual feeĮach year approximately 15% of golf courses are redesigned or newly built or the order of their holes is changed etc. The annual fee will not automatically be charged again after the year has ended. (Note: Expert Golf is NOT a subscription. However “Expert Golf” complies with the rules as per the R&A.) ![]() (Please note: Many GPS apps give advice on club selection and are therefore banned. ▸ Leading app for many years and improved with regular updates.ġ00% RULES COMPLIANT! The use of iPhones as distance measuring devices has been permitted in tournaments since, on the condition that distance measuring devices are allowed in the Local Rules. ▸ Excellent customer ratings and top rankings in the App Store. BUY EXPERT GPS FREE▸ No network coverage required (the app only uses the free GPS signal). ▸ Virtually no roaming charges (no need to download aerial photos). BUY EXPERT GPS PROFESSIONAL▸ More precise distance information thanks to mapping by professional surveyors. BUY EXPERT GPS MANUAL▸ User-friendly and intuitive operation (a manual is superfluous). An overview of the courses already mapped is available at. The database is updated and extended daily. Therefore highly-accurate data is collected in cooperation with the national surveying and topography offices and other government agencies – as opposed to most other providers whose apps are based on free aerial imagery and who thus tolerate discrepancies of tens of meters. The accuracy of the data is of utmost importance to Expert Golf. This is facilitated by a vast database containing the GPS coordinates of the golf courses. The distances are permanently available to be read off the display, without any user interaction (no aiming necessary and you do not have to be able to see the flag). You can also measure the length of your shots (e.g. On the basis of state-of-the-art GPS technology, the GPS Caddie from Expert Golf sends the exact distance to the green directly to your display – with an accuracy of 1-3 meters. ▸ GOLFERS ONLY wrote: “The perfect virtual caddie. ▸ GOLF JOURNAL wrote: “A real must for golfers who own an iPhone.” ▸ GOLF & COUNTRY wrote: “Highly-accurate data. ![]()
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