1) SMA connector => difficult to find a workable integrated antenna (provided one is like 100g)
2) My MTIg was equipped with Ublox generation 4, which is performs worse than the generation 5. In particular, they seemed to be too sensitive to all sorts of EM and/or power supply noise.
We basically replaced the GPS board by a custom one, with gen 5 and patch antenna. We lost the pressure sensor in the process, but we found it to be useless anyway for our applications.
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