Marine-Service operates Oslo-Fergene, the daily ferry boats from Vippetangen to the Oslo Fjord islands.
Lines 91, 92 and 93 -> Hovedøya, Bleikøya, Gressholmen, Lindøya east, Lindøya west and Nakholmen (all year)
Line 94 -> Langøyene (summer only)
All Ruter (Oslo's public transport company) tickets are valid on the ferries, but Ruter's travel guarantee does not apply.