Duet Alarm 对比 WMM 2020 的使用情况和统计数据
Duet Alarm is an intelligent geofence alarm that is built to smartly alert you of various location based events. Some typical examples are:
* Wakes you up to get off train no matter it's earlier or delayed.
* Shows you the current traffic around alarm area when you leaving home so that you can choose the less traffic route to take.
* Warns you when entering an area where extra caution is required, such as high-crime, dangerous-corner, speeding cameras, ticketing-traps etc.
* Reminds you to visit preset POIs when touring a new city.
* Reminds you to take a picture of where you parked before leaving the huge parking lot where you often got lost.
* and many other things or events that are location related...
It's designed to be extremely prudent on energy consumption - typical usage is less than 1% per day.
** Do NOTE that Duet Alarm doesn't work well on iPod or iPad models without GPS capability. **
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WMM 2020 is targeted towards anyone interested in navigation. This includes, pilots of aircraft, captains of sea going vessels, cartographers, engineers and surveyors. Anyone who uses maps and a compass will find the declination calculation (also referred to magnetic variation) very useful. (Declination is the difference between true and magnetic north and used when plotting a course on a map.)
WMM 2020 (World Magnetic Model) calculates the magnetic flux density for any location on the Earth. The model is accurate for dates ranging from January 1, 2020 up through December 31, 2024. Using the model, the app calculates declination and inclination. In addition, the declination trend is calculated over the five year period.
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Duet Alarm VS. 
WMM 2020十二月 19, 2024