"Tom S." wrote in
:

All the aircraft I'm looking at have an HSI. The plane I
fly with my boss has an RMI on his EFIS, but no on the
co-pilot station. So far, we've never used it.

If you have an HSI, you certainly don't want to downgrade to an
RMI. The HSI gives you much more information and is easier to
interpret.

--
Regards,

Stan