Police say in both cases the men were overdue, but had no way of telling people onshore where they were and could easily have met with tragedy.
Specialist search and rescue police staff are now pleading with Northland boaties to take some form of communication and safety gear when heading out on the water.
Constable Sue Grocott, incident controller for both rescues, said people needed to take personal responsibility when they ventured out on the sea.
"People are continuing to risk their lives out on the sea because they are ill prepared.
"With Mother Nature, you never know what she is going to do next. Just five minutes' worth of preparation before you leave could prevent these major searches," Ms Grocott said.
"It's basic safety stuff."
She urged wives and partners to ensure their men returned safely by ensuring they had communications and life jackets.
"These rescues cause so much anxiety for the families onshore."