As one gets older....one has to rely on the GPS as one cannot see the map much less read the thing!
If offshore....can one rely upon the GPS too much?
If you have exactly one....or even two GPS's...how do you know they are telling you the truth?
Perhaps you might just look for good articles on the "proper" use of GPS and draw your inferences from those by comparing known common practices to what would be "Industry Best Practices"....thus writing your very own article on the subject.