Technical information
| Type | Motor Anti-Submarine Boat |
| Displacement | 23 BRT |
| Length | 70 feet |
| Complement | 9 men |
| Armament | 8 .303 AA machine guns (2x4) |
| Max speed | 23 knots |
| Engines | Petrol engines, 2 shafts |
| Power | 1000 BHP |
| Notes on class | MA/SB 18 - 21 were completed as MGB's. Complement: 10 Displacement: 31 tons Armament: 1 2 pdr or 20mm AA or 4 .303" AA machine guns (1x4) 4 .5" AA machine guns (2x2) Other details same as above |
All ships of the BPB 70 feet-type class
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| HMS MA/SB 7 (MA/SB 7) | ||
| HMS MA/SB 8 (MA/SB 8) | ||
| HMS MA/SB 9 (MA/SB 9) | ||
| HMS MA/SB 10 (MA/SB 10) | ||
| HMS MA/SB 11 (MA/SB 11) | ||
| HMS MA/SB 12 (MA/SB 12) | Lost on 6 Feb 1941 | |
| HMS MA/SB 13 (MA/SB 13) | ||
| HMS MA/SB 14 (MA/SB 14) | ||
| HMS MA/SB 15 (MA/SB 15) | ||
| HMS MA/SB 16 (MA/SB 16) | ||
| HMS MA/SB 17 (MA/SB 17) | Lost on 11 Jun 1944 | |
| HMS MGB 19 (MGB 19) | Lost on 6 Nov 1942 | |
| HMS MGB 20 (MGB 20) | ||
| HMS MGB 21 (MGB 21) | ||
Motor Anti-Submarine Boat | ||
| ||
| HMS MA/SB 6 (MA/SB 6) | ||
Motor Gun Boat | ||
| ||
| HMS MGB 18 (MGB 18) | Lost on 30 Sep 1942 | |
| ||
Royal Navy (more on See all Motor Anti-Submarine Boat classes.