Honestly jmr,
I use paper with SH3 due to the authentic feel of what "they" had to use back during the war years and the tediousness of F5 screen conversions. It slows down the game-play a bit but at my age I like to savor the experience...and...unlike the F5 I now have a visual record of my cruises.
I switch between paper & the F5 screen with SH4 as the F5 is in Lat/Long and a lot more convenient.
If you use those downloadable plotting sheets offered by 6SJ7GT (sprinkled throughout his posts) you can save some time and avoid the extra math...(that's the part I like, however
)
Cheers,