You'll be fine going out some miles as long as the weather is good. Just be aware if the wind tends to pick up at a certain time where you're navigating because sometimes the way back can be quite wet and uncomfortable. If you notice that the sea is becoming more choppy don't risk it and come back to shore while it's still easy.
Usually when I want to go out angling I go in the morning when the sea is usually calmer and come back just mid afternoon before the wind starts to pick up. But I have been angling in the afternoon and the sea was so flat it looked like I was inside a harbor. No decent fish though (man I really got to get a sonar