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Mariner
Merchant mariner
Sea days in 2026
0
360 days to AB Special
0 / 360
0
5-yr renewal
0
Oceans
0
100+ GRT
360 more days in the last 5 years for MMC renewal.
Other ways to renew: an open-book exercise, an approved refresher course, or 3 years of closely related employment. An officer endorsement that requires it still uses 90 days in the last 3 years (0 logged).
Rule source: 46 CFR 10.227