Here are some I enjoyed:
HISTORY, BIOGRAPHY, POLITICS, WAR, HISTORICAL NOVELS
Dreadnought (19th cent. lead-up to WW I, development of battleships) Robert Massie
Castles of Steel (WW I battleships and battles)
The Caine Mutiny Herman Wouk
The Hunt for Red October Tom Clancy
The Riddle of the Sands (cruisers discover German pre WW II buildup) Erskine Childers
The Cruel Sea (true stories - escorting convoys during WWII) Nicholas Monsarrat
Sea of Thunder Evan Thomas
Sea of Glory Nathaniel Philbrick.
Alaska James Michener
Tales of the South Pacific
Empire of Blue Water Stephen Talty
BOATS, CRUISING, FISHING, EXPLORATION, the SEA
Jack Aubrey series (Master and Commander, etc) Patrick O’Brian
The Golden Ocean & The Unknown Shore (prior to Aubrey series)
Cochrane (the real captain who was the model for Jack Aubrey) Robert Harvey
The Old Man and the Sea Ernest Hemingway
The Sea Wolf Jack London
Alaska Blues, and others (travel and fishing in SE Alaska) Joe Upton
The Curve of Time (early power boat cruising on the BC coast) Wylie Blanchet
My Old Man and the Sea (Sailing around South America and Cape Horn) Hays & Hays
In the Heart of the Sea (Moby Dick was based on this true story) Nathaniel Philbrick
Over the Edge of the World (Magellan's Circumnavigation) Laurence Bergreen
Mutiny on the Bounty Charles Nordhoff
Endurance: true story of Ernest Shackleton’s Incredible Antarctic Voyage Alfred Lansing
(or)
South: A Memoir of the Endurance Voyage Ernest Shackleton
The Perfect Storm (sinking of the sword fishing boat Andrea Gail) Sebastian Junger
The Hungry Ocean, and others Linda Greenlaw
(stories by the real female sword boat captain involved in the Perfect Storm)
Blues John Hersey
River Horse William Least Heat Moon
Grey Seas Under (Remarkable rescues on high seas of the north Atlantic) Farley Mowat
The Boat Who Wouldn’t Float
Adrift (True story of survival raft crossing the Atlantic) Steven Callahan
Cape Horn (scary true adventure, sailing the southern ocean) Hemingway-Douglass
Cod (the fish that helped inspire discovery and exploration of N. America) Mark Kurlansky
Longitude (revolutionary improvement in navigation - invention of Chronometer) Dava Sobel
Where the Sea Breaks its Back (discovery of Alaska by Bering and Stellar) Corey Ford
Working on the Edge, & others (King Crab fishing in the Bering Sea) Spike Walker
Travels in Alaska John Muir
Heart of the Raincoast (life on the BC Coast) Morton & Proctor
Snow Falling on Cedars David Guterson
Sitka (historically-based Alaska adventure) Louis L’Amour
The Blue Bear Lynn Schooler