Back in 2010, I published a GPS feature comparison which focused on speed sailing and GPS devices of the time.
Things have moved on significantly in recent years, so this repository contains some more up-to-date information.
Here is a selection of articles providing advice and guidance:
There is a separate page for popular GPS devices:
Technical articles are also available in other GitHub repositories:
If you wish to make contact, feel free to message me on Facebook or Seabreaze.com.