Edit your Spot to better categorize it.
First, select a Spot on the map, and press Edit in the bottom menu. From the Edit Screen, you can change its name, location and assign it a new category.
The available categories are:
Star - default selection for saved spots
Anchor - useful to store your favorite anchor locations
Dive - useful to keep track of your favorite diving locations
Fish - Never forget where you found fish. Select this one for saving your fishing locations
Mooring - useful to save a suitable mooring location
Danger - keep track of dangers that are not part of the official cartography
Home - this is a special type of spot, more on that in the next section
The video below shows you how to edit a Spot.