![[upl-image-preview url=https://storage.hamcq.cn/2024-04-08/1712543586-217877-1712321972042.png] [upl-image-preview url=https://storage.hamcq.cn/2024-04-08/1712543586-642594-1712321937040.png] ](https://) 同一台FT5DR，选择是APRS位置自动模式，每次APRS.TV和APRS.cn显示出来的位置都有不小的差距，相比APRS.cn最离谱，差出快100公里了。不知道哪里设置的有问题，还是设备的定位有问题。

aprs.tv和aprs.cn都是互联网aprs历史数据，需要点详情，看看记录的时间甚至转发网关。ft5dr是无线方式，需要周围有aprs的网关将你的无线信号转发到互联网。你可以再找个aprs电台收一下手台的实时信号是不是准确。互联网数据难以判断。

@"BI4IRZ"#p15136 我查了数据包和轨迹，记录的经纬度数据也不同。我拿三部有GPS功能的数字台在同一个地点测试一下定位去。

结合时间查看一下源数据包 https://aprs.fi/?c=raw&call=BI1ODV-7&limit=50&view=normal [upl-image-preview url=https://storage.hamcq.cn/2024-04-08/1712563014-25271-image.png]

@"troilus"#p15165 谢谢，这个是我另一个车台的APRS，数据的时间、地点都没问题。有问题的是我的FT5DR，我正准备那几个GPS台子一起测试。

手机上有基站定位辅助，在室内也可以快速定位。而手台只能依赖GPS卫星数据，在露天环境也需要三五分钟才能搜到星。而且要有三个星以上的数据，才能让数据更精准。所以刚开机一段时间有较大误差属于正常现象。

@"BI4IRZ"#p15184 不是刚开机，拿了几台机子测试了一下，5DR的定位确实有问题。

The same device, using two different APRS maps, gave different locations, leaving me completely confused.

BI1ODV

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With the same FT5DR, when using the automatic APRS location mode, there's a significant difference between the locations displayed on both APRS.TV and APRS.cn. The difference with APRS.cn is particularly noticeable, sometimes exceeding 100 kilometers. I suspect there might be an issue with the settings or that the device's positioning system is malfunctioning.

BI4IRZ

aprs.tv and aprs.cn are historical APRS data available on the internet. To view the details, you can see the recording time and even forward to other gateways. FT5DR uses a wireless method; it requires nearby APRS gateways to transmit your wireless signal to the internet. You can also find another APRS radio station to receive the real-time signal from your handheld device to verify its accuracy. It is difficult to determine the accuracy of internet data.

BI1ODV

BI4IRZ I checked the data packets and trajectories, but the recorded latitude and longitude data were also different. I then tested the positioning accuracy using three digital receivers with GPS functionality at the same location.

troilus

Check the source packet by time.
https://aprs.fi/?c=raw&call = BI1ODV-7&limit = 50&view = normal

BI1ODV

troilus Thank you, this is the APRS data for another of my vehicles, and the time and location information are correct. The problem is with my FT5DR; I am about to test it along with a few other GPS units.

BI4IRZ

The phone has base station positioning assistance, which allows for quick location determination even indoors. However, the handheld device can only rely on GPS satellite data, and it may take several minutes to acquire a signal outdoors. Furthermore, at least three satellites are required for accurate positioning. Therefore, a significant error during initial startup is normal.

BI1ODV

BI4IRZ It wasn't just a fresh boot; I tested several machines, and the 5DR positioning was indeed problematic.

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