Offshore I do use GPS. I set the destination and then try to maintain the best VMG to that destination.
For coastal I like the ETA functions when I am attempting to get through a pass at which I need to arrive at a specific time. The Yucultas can only be transitted once a day in daylight hours when going north.
For most other activities the use SD's mark I eyeball and paper charts.
The boats I sail all have chartplotters. I have a laptop based system and I now have charts on my Android phone. I use these to discuss the differences among the various systems.
I would never use a GPS to go through a narrow channel.
ISPA Yachtmaster Offshore Instructor Evaluator
CYA Advanced Cruising Instructor
IYT Yachtmaster Coastal Instructor
As I sail, I praise God, and care not. (Luke Foxe)