"Michael" wrote in message
...
1 When to use them: In an out of harbors obvously.
Not necessarily. Practice makes perfect.

In narrow fairways and
rivers or canals.

Very narrow. Learn to tack.

When the speed of sailing is not sufficient to the arrival
goal, unless you are a purist which I'm not.

When caught in the doldrums.

Then, what's the rush?

2. When not to use the engine. Most of the time. It certainly de-tracts
from the peace of it all. When in a race that doesn't allow it, when you
are down to the last 1/3 of a tank. . . . . .and so on and so forth.

See above.

3. Add your own reasons. In the end they will always be 'your own
reasons.'

How about to practice not relying on it. Dock under sail. Anchor under
sail. Pick up a mooring under sail.