Leica GPS1200 Series Technical Reference Manual page 54

Equipment Setup GPS1200 54
When using the adapter and carrier, ensure that the GNSS antenna and the adapter
assembly slide down the full length of the carrier stub. An incorrectly mounted GNSS
antenna will have a direct effect on the results.
If the receiver is left in the container during use in high temperatures, the lid should be left
open. Refer to the GPS1200 User Manual for operating and storage temperatures.
Use an external battery such as GEB171 to ensure operation for a full day.