In Pikmin 1, Olimar writes an entry in is Voyage Log at the end of each day. The player can see the page before the End of the Day screen. To access them at a later time, the player must press Y on the Area Select screen.
Below are quotes of said entries.
Specific days
1 Day Since Impact
"I have somehow managed to launch the Dolphin, but I was surprised to see the Onion lift off with me. Perhaps the Pikmin cannot survive overnight on the planet's surface. Or have they merely decided to join me for other reasons? Either way, it seems they will help me again, tomorrow.
The Dolphin is missing 29 parts. If I can't recover them all, I may never return home to my family on Planet Hocotate. Analysis shows life-support systems will function for only 29 more days. How can I repair my Dolphin in such a short time? A dense forest is visible on the surface below. As it holds the keys to my survival, I name it the Forest of Hope. I explore it tomorrow..."
2 Days Since Impact
"It appears that many of my ship's parts have landed in this region. If I can just recover the parts of my radar, I should be able to use my radar screen. How that would improve my chances! Then, I'd only have to press Y to locate my parts.
Yet...there seems to be many hostile life-forms here. If I am attacked and my space suit takes damage, I must return to the ship, stand in front of it and press A to make suit repairs. As I explore, I must pay attention to my suit's damage meter in the bottom-left corner of the screen."
29 Days Since Impact
"Tomorrow is the day my life-support system fails. If I do not recover all my parts, I have no choice but to try to blast off. Missing a few parts may not affect my attempts to return to Hocotate...but then again, it may. At any rate, I must try to recover the remaining parts tomorrow."