# GZ convoys

The GZ convoys were a series of Caribbean convoys which ran during the Battle of the Atlantic in World War II.
They take their name from the route: Guantanamo, Cuba to Cristóbal, Colón, Panama

## Overview

The GZ series was the reverse of ZG series that ran from 31 August 1942 until 17 May 1945. There were 139 GZ convoys, comprising 1,151 individual ship listings. The escort ships for these convoys are not listed in the reference cited. Almost all ships listed in a convoy made the complete trip between Guantanamo and Cristóbal with a few going to Kingston, Jamaica, or Cartagena, Colombia.
The series started with GZ 1 through GZ 139 with only 1 convoy being cancelled, GZ 31. There are only two ships listed as being lost, and the losses were not due to enemy action, one grounded and broke in two and the other was from a collision.

## Convoy List
### 1942

| Convoy | Departure Date | Arrival Date | No.of Merchant Ships | Notes |
| GZ 1 | 31 August 1942 | 3 September 1942 | 8 | 0 vessels lost |
| GZ 2 | 7 September 1942 | 11 September 1942 | 11 | 0 vessels lost |
| GZ 3 | 13 September 1942 | 17 September 1942 | 14 | 0 vessels lost |
| GZ 4 | 20 September 1942 | 24 September 1942 | 12 | 0 vessels lost |
| GZ 5 | 27 September 1942 | 30 September 1942 | 15 | 0 vessels lost |
| GZ 6 | 4 October 1942 | 9 October 1942 | 28 | 0 vessels lost |
| GZ 7 | 12 October 1942 | 16 October 1942 | 12 | 0 vessels lost |
| GZ 7A | 12 October 1942 | 16 October 1942 | 3 | 0 vessels lost |
| GZ 8 | 16 October 1942 | 19 October 1942 | 6 | 0 vessels lost |
| GZ 9 | 23 October 1942 | 26 October 1942 | 15 | 0 vessels lost |
| GZ 10 | 31 October 1942 | 4 November 1942 | 18 | 0 vessels lost |
| GZ 11 | 8 November 1942 | 12 November 1942 | 16 | 0 vessels lost |
| GZ 12 | 16 November 1942 | 19 November 1942 | 20 | 0 vessels lost |
| GZ 13 | 24 November 1942 | 27 November 1942 | 24 | 0 vessels lost |
| GZ 14 | 2 December 1942 | 5 December 1942 | 17 | 0 vessels lost |
| GZ 15 | 10 December 1942 | 13 December 1942 | 13 | 0 vessels lost |
| GZ 16 | 18 December 1942 | 21 December 1942 | 15 | 0 vessels lost |
| GZ 17 | 26 December 1942 | 29 December 1942 | 18 | 0 vessels lost |

### 1943

| Convoy | Departure Date | Arrival Date | No.of Merchant Ships | Notes |
| GZ 18 | 3 January 1943 | 7 January 1943 | 14 | 0 vessels lost |
| GZ 19 | 13 January 1943 | 17 January 1943 | 1 | 0 vessels lost |
| GZ 20 | 23 January 1943 | 27 January 1943 | 16 | 0 vessels lost |
| GZ 21 | 5 February 1943 | 8 February 1943 | 4 | 0 vessels lost |
| GZ 22 | 15 February 1943 | 18 February 1943 | 4 | 0 vessels lost |
| GZ 23 | 25 February 1943 | 1 March 1943 | 6 | 0 vessels lost |
| GZ 24 | 7 March 1943 | 11 March 1943 | 3 | 0 vessels lost |
| GZ 25 | 17 March 1943 | 21 March 1943 | 15 | 0 vessels lost |
| GZ 26 | 27 March 1943 | 31 March 1943 | 22 | 0 vessels lost |
| GZ 27 | 31 March 1943 | 3 April 1943 | 11 | 0 vessels lost |
| GZ 28 | 10 April 1943 | 14 April 1943 | 27 | 0 vessels lost |
| GZ 29 | 20 April 1943 | 24 April 1943 | 12 | 0 vessels lost |
| GZ 30 | 30 April 1943 | 4 May 1943 | 13 | 0 vessels lost |
| GZ 31 | | | | Cancelled |
| GZ 32 | 20 May 1943 | 24 May 1943 | 8 | 0 vessels lost |
| GZ 33 | 30 May 1943 | 3 June 1943 | 16 | 0 vessels lost |
| GZ 34 | 9 June 1943 | 13 June 1943 | 4 | 0 vessels lost |
| GZ 35 | 19 June 1943 | 23 June 1943 | 11 | 0 vessels lost |
| GZ 36 | 29 June 1943 | 2 July 1943 | 3 | 0 vessels lost |
| GZ 37 | 9 July 1943 | 12 July 1943 | 1 | 0 vessels lost |
| GZ 38 | 19 July 1943 | 22 July 1943 | 3 | 0 vessels lost |
| GZ 39 | 29 July 1943 | 2 August 1943 | 2 | 0 vessels lost |
| GZ 40 | 8 August 1943 | 12 August 1943 | 9 | 0 vessels lost |
| GZ 41 | 18 August 1943 | 22 August 1943 | 8 | 0 vessels lost |
| GZ 42 | 28 August 1943 | 1 September 1943 | 1 | 0 vessels lost |
| GZ 43 | 7 September 1943 | 11 September 1943 | 1 | 0 vessels lost |
| GZ 44 | 16 September 1943 | 20 September 1943 | 3 | 0 vessels lost |
| GZ 45 | 26 September 1943 | 30 September 1943 | 2 | 0 vessels lost |
| GZ 46 | 7 October 1943 | Not listed | 3 | 0 vessels lost |
| GZ 47 | 16 October 1943 | 19 October 1943 | 5 | 0 vessels lost |
| GZ 48 | 26 October 1943 | Not listed | Not listed | |
| GZ 49 | 5 November 1943 | 9 November 1943 | 9 | 0 vessels lost |
| GZ 50 | 15 November 1943 | Not listed | Not listed | |
| GZ 51 | 25 November 1943 | 30 November 1943 | 3 | 0 vessels lost |
| GZ 52 | 5 December 1943 | 9 December 1943 | 10 | 0 vessels lost |
| GZ 53 | 15 December 1943 | 19 December 1943 | 22 | 1 vessel lost; James Withycombe, ran aground off Cristóbal, broke in two and was abandoned |
| GZ 54 | 25 December 1943 | 29 December 1943 | 20 | 0 vessels lost |

### 1944

| Convoy | Departure Date | Arrival Date | No.of Merchant Ships | Notes |
| GZ 55 | 5 January 1944 | 9 January 1944 | 17 | 0 vessels lost |
| GZ 56 | 15 January 1944 | 19 January 1944 | 14 | 0 vessels lost |
| GZ 57 | 24 January 1944 | 28 January 1944 | 19 | 0 vessels lost |
| GZ 58 | 3 February 1944 | 7 February 1944 | 14 | 0 vessels lost |
| GZ 59 | 13 February 1944 | 17 February 1944 | 16 | 0 vessels lost |
| GZ 60 | 23 February 1944 | 27 February 1944 | 16 | 0 vessels lost |
| GZ 61 | 5 March 1944 | 9 March 1944 | 7 | 0 vessels lost |
| GZ 62 | 15 March 1944 | 19 March 1944 | 14 | 0 vessels lost |
| GZ 63 | 24 March 1944 | 28 March 1944 | 20 | 0 vessels lost |
| GZ 64 | 4 April 1944 | 8 April 1944 | 16 | 0 vessels lost |
| GZ 65 | 14 April 1944 | 17 April 1944 | 19 | 0 vessels lost |
| GZ 66 | 23 April 1944 | 28 April 1944 | 9 | 0 vessels lost |
| GZ 67 | 4 May 1944 | 8 May 1944 | 5 | 0 vessels lost |
| GZ 68 | 14 May 1944 | 18 May 1944 | 8 | 0 vessels lost |
| GZ 69 | 23 May 1944 | 27 May 1944 | 11 | 0 vessels lost |
| GZ 70 | 3 June 1944 | 7 June 1944 | 13 | 0 vessels lost |
| GZ 71 | 8 June 1944 | 11 June 1944 | 14 | 0 vessels lost |
| GZ 72 | 13 June 1944 | 17 June 1944 | 20 | 0 vessels lost |
| GZ 73 | 18 June 1944 | 22 June 1944 | 12 | 0 vessels lost |
| GZ 74 | 21 June 1944 | 25 June 1944 | 11 | 0 vessels lost |
| GZ 75 | 28 June 1944 | 2 July 1944 | 11 | 0 vessels lost |
| GZ 76 | 3 July 1944 | 7 July 1944 | 14 | 0 vessels lost |
| GZ 77 | 8 July 1944 | 12 July 1944 | 14 | 0 vessels lost |
| GZ 78 | 13 July 1944 | 17 July 1944 | 13 | 0 vessels lost |
| GZ 79 | 18 July 1944 | 22 July 1944 | 11 | 0 vessels lost |
| GZ 80 | 23 July 1944 | 27 July 1944 | 13 | 0 vessels lost |
| GZ 81 | 28 July 1944 | Not listed | 4 | 0 vessels lost |
| GZ 82 | 2 August 1944 | 6 August 1944 | 3 | 0 vessels lost |
| GZ 83 | 7 August 1944 | 11 August 1944 | 3 | 0 vessels lost |
| GZ 84 | 12 August 1944 | 15 August 1944 | 9 | 0 vessels lost |
| GZ 85 | 17 August 1944 | 21 August 1944 | 9 | 0 vessels lost |
| GZ 86 | 22 August 1944 | 25 August 1944 | 9 | 0 vessels lost |
| GZ 87 | 27 August 1944 | 31 August 1944 | 7 | 0 vessels lost |
| GZ 88 | 1 September 1944 | 5 September 1944 | 9 | 0 vessels lost |
| GZ 89 | 6 September 1944 | 10 September 1944 | 5 | 1 vessel lost; Hindoo, collided with Australia Star and sank in the Caribbean Sea |
| GZ 90 | 10 September 1944 | 13 September 1944 | 5 | 0 vessels lost |
| GZ 91 | 16 September 1944 | 20 September 1944 | 5 | 0 vessels lost |
| GZ 92 | 21 September 1944 | 25 September 1944 | 4 | 0 vessels lost |
| GZ 93 | 26 September 1944 | 30 September 1944 | 6 | 0 vessels lost |
| GZ 94 | 1 October 1944 | 4 October 1944 | 2 | 0 vessels lost |
| GZ 95 | 6 October 1944 | 9 October 1944 | 2 | 0 vessels lost |
| GZ 96 | 11 October 1944 | 14 October 1944 | 7 | 0 vessels lost |
| GZ 97 | 16 October 1944 | 20 October 1944 | 11 | 0 vessels lost |
| GZ 98 | 21 October 1944 | 24 October 1944 | 3 | 0 vessels lost |
| GZ 99 | 26 October 1944 | 29 October 1944 | 3 | 0 vessels lost |
| GZ 100 | 31 October 1944 | 3 November 1944 | 4 | 0 vessels lost |
| GZ 101 | 5 November 1944 | 9 November 1944 | 7 | 0 vessels lost |
| GZ 102 | 10 November 1944 | 13 November 1944 | 1 | 0 vessels lost |
| GZ 103 | 15 November 1944 | 18 November 1944 | 5 | 0 vessels lost |
| GZ 104 | 20 November 1944 | 23 November 1944 | 1 | 0 vessels lost |
| GZ 105 | 25 November 1944 | 28 November 1944 | 3 | 0 vessels lost |
| GZ 106 | 30 November 1944 | 4 December 1944 | 2 | 0 vessels lost |
| GZ 107 | 4 December 1944 | 7 December 1944 | 1 | 0 vessels lost |
| GZ 108 | 10 December 1944 | 13 December 1944 | 3 | 0 vessels lost |
| GZ 109 | 15 December 1944 | 19 December 1944 | 5 | 0 vessels lost |
| GZ 110 | 20 December 1944 | 24 December 1944 | 2 | 0 vessels lost |
| GZ 111 | 24 December 1944 | 27 December 1944 | 13 | 0 vessels lost |
| GZ 112 | 30 December 1944 | 3 January 1945 | 7 | 0 vessels lost |

### 1945

| Convoy | Departure Date | Arrival Date | No.of Merchant Ships | Notes |
| GZ 113 | 4 January 1945 | 7 January 1945 | 1 | 0 vessels lost |
| GZ 114 | 9 January 1945 | 12 January 1945 | 2 | 0 vessels lost |
| GZ 115 | 14 January 1945 | 17 January 1945 | 1 | 0 vessels lost |
| GZ 116 | 19 January 1945 | 22 January 1945 | 4 | 0 vessels lost |
| GZ 117 | 24 January 1945 | 27 January 1945 | 3 | 0 vessels lost |
| GZ 118 | 29 January 1945 | 1 February 1945 | 7 | 0 vessels lost |
| GZ 119 | 3 February 1945 | 6 February 1945 | 4 | 0 vessels lost |
| GZ 120 | 9 February 1945 | 12 February 1945 | 3 | 0 vessels lost |
| GZ 121 | 13 February 1945 | 17 February 1945 | 4 | 0 vessels lost |
| GZ 122 | 18 February 1945 | 22 February 1945 | 3 | 0 vessels lost |
| GZ 123 | 23 February 1945 | 26 February 1945 | 1 | 0 vessels lost |
| GZ 124 | 1 March 1945 | 4 March 1945 | 3 | 0 vessels lost |
| GZ 125 | 5 March 1945 | 9 March 1945 | 6 | 0 vessels lost |
| GZ 126 | 10 March 1945 | 13 March 1945 | 3 | 0 vessels lost |
| GZ 127 | 15 March 1945 | 19 March 1945 | 11 | 0 vessels lost |
| GZ 128 | 20 March 1945 | 23 March 1945 | 4 | 0 vessels lost |
| GZ 129 | 25 March 1945 | 29 March 1945 | 9 | 0 vessels lost |
| GZ 130 | 30 March 1945 | 2 April 1945 | 7 | 0 vessels lost |
| GZ 131 | 4 April 1945 | 7 April 1945 | 2 | 0 vessels lost |
| GZ 132 | 9 April 1945 | 13 April 1945 | 4 | 0 vessels lost |
| GZ 133 | 14 April 1945 | 17 April 1945 | 1 | 0 vessels lost |
| GZ 134 | 19 April 1945 | 23 April 1945 | 1 | 0 vessels lost |
| GZ 135 | 24 April 1945 | 27 April 1945 | 1 | 0 vessels lost |
| GZ 136 | 28 April 1945 | 30 April 1945 | 1 | 0 vessels lost |
| GZ 137 | 4 May 1945 | 7 May 1945 | 1 | 0 vessels lost |
| GZ 138 | 9 May 1945 | 12 May 1945 | 3 | 0 vessels lost |
| GZ 139 | 14 May 1945 | 17 May 1945 | 3 | 0 vessels lost |