The Inishowen Maritime Memorial is located at the front entrance of the Museum and commemorates all those from the Inishowen area who were lost at sea.
The centrepiece of the memorial is an Armillary sphere, an early astronomical device for representing the great circles of the heavens, to represent the navigation around the world undertaken by Inishowen seafarers.
It is set up to be used as a sundial. A table is displayed inside the museum giving corrections to be applied to convert solar time to local time.
The memorial was unveiled, in 1997, by Mary Robinson, President of Ireland.
The names on the memorial were refreshed in 2019. A register is maintained in the museum with further details of those lost and where visitors may enter details of relatives lost at sea for inclusion on the memorial at future reviews.