Peggy --

If you know the ships's time and your own computer, you might not need too many other times. That's because your computer will normally have your "home" time in the lower right corner tray (whether you are connected to the Internet or not).

That's how I keep track on the WC of what time it is in NYC and San Diego where our kids are...because the computer always always shows Chicago time and I can do the conversion easily, just like at home, for Eastern and Pacific. Now if you have friends/relatives around the world, then it does get confusing!