Many boards (in particular TBEAMs) don't have a 32khz xtal. Therefore they are just using an RC clock for timekeeping and that drifts pretty fast.

So the time of day clock (not millis() though) should be reset occasionally if !defined(HAS_HIGH_ACCURACY_CLOCK) when we receive GPS time.

Display of Map-path in Gui-list
I use paths for the maps as short as possible, so even the first characters of the filename is displayed in Gui.
By trials with navit-apk_0.5.4 I found, that these paths are no more accessible for navit. I succeeded finally with path like
"/storage/0403-0201/Android/data/org.navitproject.navit/files/SW_Paris_Grosseto.bin".
The use of this path is no problem.

The gdal library is too big. suggest remove GDAL dependent library。

I am trying to support Raspberry Pi 3. The linux driver code has the 7100 but not the 7000 listed.
When I try to compile on raspberry - jesse it gives error:
make[1]: *** /lib/modules/4.9.59-v7+/build: No such file or directory. Stop.

The Simcom site says there are both linux and android drivers for the 7000, but I can not find them.

The module works perfectly with Arduino! Thanks.
Bob