【實用交通運輸app】Speedometer - Car Speed Alert, Free Map Tracker, GPS Black Box|最夯免費app-綠色工廠好玩App

Speedometer and GPS app for both your iPhone and iPad. It displays your current speed and distance.‣ Need to know where you are?Integrated map shows your location and a tracking "tail" behind you.! You can use this app on your iPhone 3GS, 4, or 4S as well as on any iPad with 3G. **App will not work properly on iPods and wifi only iPads as they don't have GPS chip (External GPS module is required).! Please note that as with all GPS apps, continued use of GPS running in the background can dramatically decrease battery life. * If you wonder why gps speedometer may show 3-5 mph (3-8 kmh) less than a car's speedometer, you can take a look here: http://goo.gl/wtLvT (tomtom's discussion thread).** And here is an amazing article http://goo.gl/p5zfMi explaining why GPS might show you 80ft (or -80!) altitude when you are laying on the beach. Don't throw the app or iPhone away just because of that! :) Let us use the article's last sentence here: "Those who use GPS altitude to aid in landing their small plane should have their insurance policies paid up at all times".