MARC::Charset 'utf8_to_marc8'

Hi,

I'm trying to create MARC records from serials data exported from SFX, 
using  MARC::Charset version 0.98 to convert UTF-8 strings to MARC-8. It 
seems to be failing on extended latin characters like U+00C5 CAPITAL LETTER 
A WITH RING ABOVE, giving "no mapping found at position 176" for example. 
The records convert using Terry Reese's MarcEdit OK. Am I doing the wrong 
thing? Any advice gratefully received.

Many thanks,
Laurence Lockton
University of Bath
UK