A transducer system comprising: a transducer housing for mounting to a watercraft, at least one sonar transducer mounted within the transducer housing, and a mount adapter (40,63,75,90,290) that is configured to attach to the watercraft via a first type of mounting, wherein the transducer housing comprises an upper engagement surface configured to adjacently engage the mount adapter (40,63,75,90,290) to facilitate mounting, and wherein the at least one upper engagement surface is configured to releasably engage the mount adapter (40,63,75,90,290) to allow the mount adapter (40,63,75,90,290) to be detached and removed without damaging or altering the transducer housing, characterised in that said mount adapter (40,63,75,90,290) is a first mount adapter (40,63,75,90,290) and the transducer housing is slideable relative to the first mount adapter so that the upper engagement surface engages said first mount adapter (40,63,75,90,290) in a first instance to facilitate the first type of mounting, wherein the transducer system further comprises a second mount adapter (40,63,75,90,290) that is configured to attach to the watercraft via a second type of mounting that is different than the first type of mounting, said transducer housing being slideable relative to the second mount adapter so that the upper engagement surface engages said second mount adapter (40,63,75,90,290) in a second instance to facilitate the second, different, type of mounting, the upper engagement surface being configured to releasably engage the second mount adapter (40,63,75,90,290) to allow said second mount adapter (40,63,75,90,290) to be detached and removed without damaging or altering the transducer housing. a transducer housing for mounting to a watercraft, at least one sonar transducer mounted within the transducer housing, and a mount adapter (40,63,75,90,290) that is configured to attach to the watercraft via a first type of mounting, wherein the transducer housing comprises an upper engagement surface configured to adjacently engage the mount adapter (40,63,75,90,290) to facilitate mounting, and wherein the at least one upper engagement surface is configured to releasably engage the mount adapter (40,63,75,90,290) to allow the mount adapter (40,63,75,90,290) to be detached and removed without damaging or altering the transducer housing, characterised in that said mount adapter (40,63,75,90,290) is a first mount adapter (40,63,75,90,290) and the transducer housing is slideable relative to the first mount adapter so that the upper engagement surface engages said first mount adapter (40,63,75,90,290) in a first instance to facilitate the first type of mounting, wherein the transducer system further comprises a second mount adapter (40,63,75,90,290) that is configured to attach to the watercraft via a second type of mounting that is different than the first type of mounting, said transducer housing being slideable relative to the second mount adapter so that the upper engagement surface engages said second mount adapter (40,63,75,90,290) in a second instance to facilitate the second, different, type of mounting, the upper engagement surface being configured to releasably engage the second mount adapter (40,63,75,90,290) to allow said second mount adapter (40,63,75,90,290) to be detached and removed without damaging or altering the transducer housing.