I contacted the GlobalTop customer service dept regarding the altitude limitation of the Ultimate GPS module with MTK3339 chipset. They said the module can be updated with a firmware upgrade and they provided me with the software tool to apply the upgrade. However, they advised me to obtain the firmware bin file from Adafruit. Can you provide the bin file that enables fixes at 40km+?
Hi Adafruit, we've been using these GPS devices on many different data loggers for balloon launches without much issue. However, lately our data has been stopping around 87k ft. I thought the altitude limit was removed, what gives? Is there a way to correct this?
Hmm - Nothing has changed with the firmware, its been the same for quite a while and was tested at 40Km. If you can send a log showing where the data is lost, to support@adafruit with a link to this thread we'll ask the manufacturer. Also, please get the version from the module with the $PMTK605*31 command should be something like "$PMTK705,AXN_2.10...." Thanks!