Thanks to boat_alexandra for a factual response.
Strolls and gyro - I don't believe you understood the question. The tool used aboard Altamira for navigation is OpenCPN and Simrad
NSS7 chart-plotters in the N2K network. AIS is a tool used to ASSIST with the requirement to keep a proper lookout.
I didn't ask for either of your opinions. If you can't understand the question or provide an answer to the question, please refrain.
By the way, the limitation I spoke about is that, outside the range of my cellular internet provided, the AIS data would not be available.
For your information, CPA and other calculations are provided by the chart-plotter application, not AIS data - this is because the AIS data does not know about the ownship (my vessel) position, speed, etc.
Thanks for everything.