Sutherland Shires first FCO (Fire Control Officer), Ray Watchorn, developed a numbering system for fire stations and vehicles that enabled rapid identification of call signs in the field. The call sign was a four digit number, the first two being the station number, the third the vehicle type and the last the vehicle number. Sutherland Shire has thirteen stations, with Heathcote and Headquarters being recently amalgamated. The station ID numbers are :-
ID Station 10 Headquarters 11 Waterfall 12 Heathcote 13 Engadine 14 Loftus 18 Woronora 19 Menai 20 Illawong 21 Sandy Point 22 Maianbar 23 Bundeena 24 Kurnell 26 Grays PointVehicle categories were broken down as follows:-
Type Description 1 Communications 2 4x2 Personnel Carrier 3 4x4 Personnel Carrier 4 4x2 Light Striker Tanker 5 4x4 Light Striker Tanker 6 4x2 Heavy Tanker 7 4x4 or 6x6 Medium Tanker 8 4x4 Heavy Tanker 9 BoatUsing this system, 1931 is a Menai Personnel Carrier and 1891 is a Woronora Fireboat.