GPS Data Logger Software - BT747

A new compatible device got added to the list: the Royaltek MBT-1100.

In fact the Royaltek MBT-1100 has a new 'unknown' field in its log record and when the log format was set to 'full data' in the Royaltek application, this 'unknown' field was breaking the log decoder.

This is now fixed in BT747 2.X.1600 in the sense that the presence of this field is detected so that the recorded positions are retrieved correctly.  Since the meaning of this new field is currently unknown, it is further ignored for the moment.