505 (Forth) Coast Regiment RA (TA) was formed from a part of Forth Heavy Regiment RA (TA), in July 1940. The Regiment was placed in suspended animation in January 1946. 505 (Forth) Coast Regiment RA (TA) reconstituted in January 1947 as 414 (Forth) Coast Regiment RA (TA).
Illustrations of the formation badges under which a unit served or supported are given. This is no guarantee that the unit used this formations badge.
| Jul 40 | Formed from part of Forth Heavy Regiment | Inchkeith, Fife, UK | |
| Jul 40 |  |
Scottish Command | Inchkeith, Fife, UK |
| Dec 42 | Inchkeith Fire Command | Inchkeith, Fife, UK | |
| Jan 46 | Suspended animation |
Batteries
| Jul 40 | A (Inchkeith), B (Inchkeith North), C, D, E |
| Dec 40 | A, B, C, D, E, 309 (Fidra), 310 (North Berwick) |
| Apr 41 | 251 (Inchkeith), 252 (Inchkeith North), 253, 254, 255, 309, 310 |
| Nov 41 | 251, 252 (Kinghorn), 253, 254, 255, 309 |
| Jan 42 | 251, 253, 254, 255, 256, 257 |
| Aug 42 | 251, 253, 254, 255, 256, 436 (Fidra) |
| Apr 44 | 245, 247, 248, 250, 251, 253, 254, 255, 256, 436 |
| Jun 45 | 152, 245, 248, 253, 255, 256, 308, 309 (Fidra) |