I've had a West Marine "400" kit on our boat for a couple of years and it
seems about right for the the sort of problems - cuts, sprains, sea
sickness - we've encountered in cruising a few hours or a day at most away
from an emergency room. The contents are logically arranged and packed in
individual resealable plastic bags and a family doctor who looked through it
was
impressed with the logical organisation and practicality of the manual that
accompanies the kit. For an extended off-shore voyage I would "heavy it
up" with advice from a doctor but for coastal cruising I like it.
Scott