I am looking through some ship expedition data with a resolution of 1 second, recorded using a Trimble GPS. I have discovered after manually looking through the track that there are some strange features of the data that keep occurring and I am unsure what is causing them. I wondered if someone might know whether this is something to do with the instrument itself, something to do with the instrument connecting to satellites or if it is a common feature of GPS data? Or something completely different? I am quite new to working with these data and would appeciate any insight into this, or also references that would be useful please.
I have attached files as follows to investigate these features:
overlapping track 2016-12-21 at approximately 10:16
track deflection 2016-12-24 at approximately 14:44
Thank you for your help.