GPS for boat

I have a remote control baitboat. I would like to add a GPS navigation unit to it so I can store wavepoints (Good fishing spots) so that i can send the boat back to those wavepoints. It doesn't need to do this automatically (Autopilot) as I can control the boat direction and speed manually. It needs to work at a distance of 240yds approx and accurate to within 2m I've seen the ardupilot system and have been told this will work.
Can anyone help me with the Board and other components I will need to complete the project.
I'm a new member so if we can keep the technology jargon basic i'd appreciate it.
Sorry in advance if I've posted this in the wrong section of the forrum
Thanks guys :-)

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