sorry about the capitals,i thought it still readable,(unlike the altitude) and thought the.. and .. were punctuation, blind i believe is the expression used to mean connected to it,s own encoder which has it,s own static outlet.
that is to say not receiving information from a encoding altimeter.
not my machine , so the make may well of helped;once again i will work on my English.
20 years in Glasgow helped but alas now i am down south all has gone to pot,still 20 years stealing you women and jobs was great.
that in mind we may well have met
seriously thanks anyway , a shot in the dark