I found this among the specs on the motor you described. Technical data: Gear ratio 150:1; Voltage range 4.8 - 14.4V; Power consumption at 12V approx. 13,400 rpm, 2.95A at maximum efficiency.
So, it looks like your top speed (which will likely vary considerably with other factors) about 89RPM at 12V (about 1-1/2 revs per second). That's pretty slow barely moving, if at all for a 6 foot boat.
As for the ESC, the choice is yours, most "average" ESCs will handle the current, and most, but not all, will handle the voltage. Many ESCs will have options for F/B/R, some fixed, but many can be set by the user.
Check your thoughts on the need for a 1:150 geared motor to run your tanker. As I am strictly scale and not much need for speed I stick with the cheap-o brushed motors in the $5-15.00 (US) range .
You might look at this: RS775PH High Power DC Motor, DC 12V-24V 12,000 RPM @ 24V Large Torque Motor. This would be about 6,000 RPM @ 12V, probably a good choice for your tanker (direct drive, set motor limits on your transmitter). $16.99(US) on Amazon.