From my experience running a team of engineers that developed, productionized, fielded, and supported a UAV system in a combat zone I have found GPS modules to be amazingly robust when it comes to mechanical shock. I have seem small UAVs landed into a concrete wall at full throttle and fly the same electronics in the same or another bird by a simple swap out. Note: UAV engineers often use the term land where a customer might make the mistake of saying crash.