A downrigger adaptor assembly includes a seat-mounting member having a helical
spring disposed about a support post, engageable with a boat seat. The present
invention further includes a mounting plate on which a downrigger base-mounting
member is secured, and an elongated cable connected to the mounting plate and a
stationary portion of a boat so that the assembly can be maintained within a predetermined
path during operating conditions. Such a cable includes quick-release fastening
members for allowing an operator to readily adjust the predetermined path as needed.