Another Battery: question jumping a battery

[bbfan33]

I have heard different opinions concerning jumping a dead boat battery, and would appreciate the wisdom of the forum.

In the event that your boat battery is drained/dead so your boat (I/O) will not start..(someone left the radio on, etc... )
do you remove the battery from the engine compartment to jump/charge the battery
or
do you just hook up the jumper/charger as you would a car.

Any opinions concerning best option: charger vs jumper?

thanks as always
bbfan33