The following information, of concern mainly to fishing vessels, is being published for the benefit of any other vessels which may have occasion to draw nets or trawls:

Fishermen operating off the coasts of Canada are warned that both non-explosive and explosive ordnance may be discovered in normal fishing areas. These ordnance items may be brought to the surface in nets or trawls.

Non-explosive ordnance such as practice torpedoes will normally be painted bright orange, smaller non-explosive ordnance will normally be a dark or light blue. Any item which cannot be readily identified by sight as non-explosive ordnance should be treated as explosive in character. Explosive ordnance small or large will normally be painted or marked in yellow, red or green. If there is any doubt about the identity of any object brought up by nets or trawls it should be considered as an explosive.

Practice ammunition still dangerous:

a. Orange torpedo could have some Otto Fuel left in it;

b. The dark blue was the old marking for dummy ammunition now it is bronze;

c. Colour Codes Above 20mm

i. Yellow High Explosive
ii. Brown Low Explosive
iii. Grey Chemical
iv. Black Armour Defeating
v. Light Green Smoke
vi. Light Red Incendiary
vii. Orange Recoverable

d. When a colour for a primary role does not in itself indicate the presence of an explosive or other hazardous material, the presence of these materials may be indicated by narrow bands or by letters applied in an appropriate colour of the code.

3  Explosive ordnance may still be dangerous even if they have been in the water for many years. Suspected explosive ordnance should be treated with great care, and if observed in the net or trawl while still outboard, no attempt should be made to bring it alongside or aboard. The trawl should be lowered and where possible, towed clear of regular fishing grounds before cutting away the net as necessary.

4  In the event that a suspected explosive ordnance item cannot be released or freed by cutting the net or line, the following actions are advised:

(i) Stream the object as far aft as possible.

(ii) Notify nearest Joint Rescue Coordination Centre (JRCC) and stand by for instructions or help.

(iii) Position the crew at forward end of vessel keeping the deck house between themselves and the object astern.

(iv) Maintain steerageway as necessary to stay in the area until help or instructions arrive.

5  In the event of a suspected ordnance item not being detected until the contents of the trawl have been discharged on deck, the following action should be taken:

(i) Great care should be taken to avoid bumping the object.

(ii) It should be stowed on deck away from heat and vibration.

(iii) It should be firmly chocked up and well secured to prevent movement.

(iv) It should be kept covered up and dampened down. (This is important because any explosive which may have become exposed to the atmosphere is liable to become very sensitive to shock if allowed to dry out).

(v) Notify nearest Joint Rescue Coordination Centre (JRCC) and stand by for instructions. The JRCC will contact the nearest EOD team for direction.

6  A ship with a suspected explosive item on board or in her gear, should warn other ships in the vicinity giving her position.

Note:  The accompanying plates showing ordnance used currently and in the past by DND ships and aircraft, will assist in identifying explosive ordnance that may be recovered from the sea.

NAVAL Underwater charges

Signal Underwater Sound MK411 (Reduced Charge) (SUS) 
Signal Underwater Sound MK 410 (High Explosive)

Depth Charge High Explosive DM211 

Signal Sound Marine MK NC 1 Mod 1


82 mm Rocket Practice MASS Decoy

MK 234 Electronic Decoy Cartridge (Nulka)

Cartridge 5.125 Inch Chaff

Rocket 100mm Radar Echo Practice C20

NAVAL Pyrotechnics

Signal Smoke Aircraft Orange Drift Indicator C8

Marker Location marine C2A1

Marker Man Over Board (MMOB)

38mm Hand Held Illuminating Signal Flare (Radaflare)

Signal Smoke and Illumination Marine 
Mk 66 Mod 2

Signal Smoke Marine MK3 Orange
Mk 66 Mod 2

Marker Man Overboard 
Smoke and Light 
Length 500 mm 
Diameter 190 mm 
(including the float)

Signal Illum 
Marine Red Pinpoint Mk7 
Length 247 mm 
Diameter 35 mm

Rocket 100 mm Radar echo P8 

Length 1700 mm 
Diameter 102 mm

100 mm Infra red Decoy P6 

Length 1600 mm 
Diameter 103.2 mm

Flare Aircraft Parachute LUU 2AB/2BB 

Length 91.4 cm 
Diameter 12.4 cm

Signal Underwater Sound Mk411 

Length 38.1cm 
Diameter 7.62cm

Signal sound Marine

Height 8.89 cm 
Diameter 7.62 cm

Signal Illum A-C 
Single star 1.5 inch 

Length 82.6 mm 
Diameter 38 mm

Marker Location Marine C1A1 or C1A2 

Length 47 cm 
Diameter 7.56cm

5.125 inch chaff Mk 182 

Length 1206.5 mm
Diameter 130 mm

Marker Location Marine Mk 58 

Length 21.5 inches 
Diameter 4.9 inches

Signal Distress Day and Night 

Length 135 mm 
Diameter 42 mm

Marker Man Overboard, Light And Smoke, Series III

NAVAL Shells





Mk46 Torpedo

Mk48 Torpedo

Cart 57mm Pre-Fragmented High Explosive

Cartridge 40mm 
High Explosive-tracer (HE-T)

Cartridge 57mm Non-Frag Brown Band 
Low Explosives

Both are inert Dummy 40mm Drill 40mm

Cartridges 40mm Practice (BL/P)

Projectile inert but could have live primer and propellant in cartridge case

Other Possible Ordonance

Depth Charge HE DM211 Anti-Frogman 

Length 268mm 
Diameter 60mm

Practice bomb

2.75 inch rocket motor

2.75 inch warhead

Authority: Department of National Defence (NDHQ)