Start by getting a toy you can afford to lose or damage, then when you can fly proficiently get an expensive one with a good camera on it that can transmit good quality video back to base & good range & battery life. Many options for this, the only limit is your budget.
This guy flies on & off the boat, takes a fair bit of experience to do this & be careful; catching drones can equal blood.
camera drones
This article is actually about Drone Fishing, not just spotting. Some excellent advice & info in there.
If you need help learning how to fly >
The Rules in AU, CASA UAV rules >
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