Meaning of CUMBER:

Middle English combren, to annoy, from Old French combrer, from combre, hindrance, from Vulgar Latin *comboros, of Celtic origin.]

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Guernsey Crew Lists index
Guernsey registered ships from those "Agreement & Crew Lists" documents that have survived.

CUMBER Charles Ordinary Seaman age 20 Guernsey Ship Dispatch 1857
 http://history.foote-family.com/maritime/index.htm

The Barque Dispatch

At the time of its launch, the Dispatch was the second largest ship ever built in Guernsey. She was 106 feet long, 24 feet wide, and had a full-length figure of Mercury as a figurehead. She sank off the coast of Madeira after the crew had spent five days pumping water out of the hold. A lifeboat with the master (Alfred Eastland) and five of the crew made it safely to Tenerife three days later. Two other boats containing the rest of the crew were lost.

Built Guernsey, 1849 Builders Marquand & De La Mare Tons 338
Owners
George Foote
Francis Lamble
Charles Henry Baskfill
John David
Mary David
Gustave Carrington
Masters
John David (1849-1855)
Clement Day (1855-1860)
John Joseph Coles (1860-1861)
Alfred Eastland (1862-1863)
Fate Sank NE Madeira, 1863

Details from:
http://history.foote-family.com/maritime/index.htm