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Also might sound a bit obvious, but you can get into vehicles from the water. A useful tip is to hold E and you'll jump into the vehicle as soon as it comes in range, rather than spamming E. Very useful if you're the bomb carrier in obliteration and someone is coming to pick you up in a chopper.
@tombull89 Also true. It's kinda obvious, but I'll add it to the list. And the thing with holding E is very useful, also on land. Prevents you from accidentally getting out of the chopper that just picked you up.