While it's a simple way to transfer photos from the camera direct, if there are any power issues, you can ruin your camera and damage the cards. It is much better to download using a card reader. They're less than $25. You can buy two or three card readers and download from multiple cards into the same folder at the same time.

VOYAGER:
MC to FLL 11/07
MC/Dover 6/06
MARINER:
BCN / Ven 10/11
Alaska 2001|2006
Panama Canal 2003
NAV
Caribbean 11/06
Bermuda|New Eng/Canada 6/04
PG 5/05
OCEANIA
Nautica |Ist/Athens 6/07
Regatta|Baltics 6/08
Riviera 2013 Crossing -Istanbul to Miami