Firmware 2.4
1. Logs are not taken for about 28 hours every 49.6 days.
GPS engine seems to sleep for about 28 hours.
When connected to USB, COM port is recognized but NMEA sentences are not output.
The logger responds to switch operations.
Reset operations and Factory resets do not restore the device.
Automatic recovery after about 28 hours.
Next occurrence forecast
Approximately 28 hours from 16:00 (UTC) on January 10, 2025 (may vary depending on the device).
2. The routine to convert from UTC to Local time does not support leap years.
Example: 2024/02/28 16:00:00 + 9h → 2024/03/01 01:00:00 (Correct time is 2024/02/29 01:00:00)
3. Sometimes the log time is incorrect only once.
INDEX,TAG,DATE,TIME,..
...
803,T,240125,074903,..
804,T,240125,074904,..
805,T,240125,142405,.. <--- Time error
806,T,240125,074906,..
807,T,240125,074907,..
INDEX,TAG,DATE,TIME,..
...
6444,T,240908,164646,..
6445,T,240908,164647,..
6446,T,240908,101431,.. <--- Time error
6447,T,240908,164649,..
6448,T,240908,164650,..
4. The time of GNGGA sentences in NMEA output via USB is delayed by 1 second (about 0.2 seconds when output at 5Hz).
5. The time of the CSV and GPX logs is in 1 second units, so in the case of a 5Hz log, the same time is output five times.
Even with CSV and GPX logs at 1 second intervals, the same time is output about 20 times per hour.
6. USB memory device removal operation is incomplete (even if the device is removed, it can be accessed from Explorer and removed again).
Firmware 2.2
1.It may take more than 30 seconds for MicroSD to be recognized after USB connection (usually within 4 seconds).
2.MicroSD remains recognized even after the USB memory is ejected (no error occurs even if it is removed).
3.CSV log header is "INDEX,TAG,DATE,TIME,LATITUDE N/S,LONGITUDE E/W,HEIGHT,SPEED,HEADING"
Positioning status is not recorded.
4.The date and time in the CSV log are numbers without separators, and the year is only the last two digits (the format is yymmdd,hhmmss).
5.Since the time of CSV and GPX logs is in units of 1 second, the same time is output 5 times in the case of 5Hz log.
The same time is output about 20 times per hour even with a log interval of 1 second.
6.NMEA output and NMEA log sentences are only GGA and RMC, and the positioning status is only 2 types of positioning "Invalid" and "SPS fix".
7.The time of GGA sentences of NMEA output via USB is 1 second behind RMC (0.2 seconds behind when output at 5 Hz).
 "Tool" -> "Time lag of GPS to PC" in "NMEA Monitor for windows"
8.Static navigation (Clamping function) is enabled.
The latitude and longitude are locked when the speed is less than about 1 km/h, and when the speed increases, the completion is output at intervals of about 8.5 m Max at once.
Therefore, the time for the log position is incorrect.
Even if the direction is changed while moving at low speed, the starting and ending points seem to be complemented in a straight line.
For this reason, it is not suitable for applications such as obtaining the coordinates of a specific position or low-speed drift recording of floating islands.
Cannot turn off static navigation because it does not accept NMEA commands.
Data comparison of P-10 Pro (1Hz log) and ZED-F9P (CLAS) during low speed movement
Locus on map
Elapsed time and moving distance.
9.Occasionally, pressing the power button and POI button at the same time may not work (resolved by pressing the reset hole).
10.The power button is a little hard to push.
11.Batteries are not replaceable.
12.Difference in tracks according to holding position (Overhead and Breast pocket).
Improvement requestt
Want to add to CSV log: Time in 0.1 second units, GPS status, battery level.
Completely remove the USB memory and stabilize the recognition time when connecting.
Reference
Columbus P-7 Pro report
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