How to extrude in the same way a "3D" angle? I'm modeling a rubber boat.
I want to extrude the edges of a cylinder in the same way they point before not only slightly up but also slitghly to the left (inwards). If I only extrude "in the same angle" it will causes the rubber boat to have a "nib" and that's not what they look like. Is it possible to extrude it following these two angles (the light blue I drawn and the orange one) without using freehand?
What I do, and what Mr Zak mentioned in the comments, is to create a temporary face then extrude from that.

Simply select the end edge loop, and press F to make a face. 
Blender needs some direction to extrude along, making a face creates a face normal.

Now blender will automatically extrude along that face normal. Note that in order for this to work correctly the face must be flat.  

In this gif I first extrude with no face showing that there is no auto direction. Then I undo that, create a face and extrude again, this time along the new face normal.