As of March 2021, foreign investment in international passenger maritime transportation and port services are no longer restricted; all other maritime and water passenger and cargo transportation activities remain limited to 49% of equity interest.
"APPENDIX III - REGULATION OF THE PRESIDENT OF THE REPUBLIC OF INDONESIA NUMBER 49 OF 2021 CONCERNING AMENDMENT TO PRESIDENTIAL REGULATION NUMBER 10 OF 2021 CONCERNING THE INVESTMENT BUSINESS SECTOR
LIST OF BUSINESS FIELDS WITH CERTAIN REQUIREMENTS
- Domestic Liner and Tramper Sea Transportation for Passengers; Domestic Sea Transportation for Tourism; Pioneer Domestic Sea Transportation for Passengers: Foreign capital ownership: Max.49% [no change;  see 2019 restrictions below]
- Domestic Sea Transportation Liner and Tramper for Goods; Domestic Sea Transportation for Special Goods; Pioneer Domestic Sea Transportation for Goods [connecting remote areas]; Public Shipping Domestic Sea Transportation;: Foreign capital ownership: Max.49% [no change;  see 2019 restrictions below]
- Overseas Liner and Tramper Marine Transportation for Goods; Overseas Sea Transportation for Special Goods: Foreign capital ownership: Max.49% [overseas passenger marine tranportation now excluded];  see 2019 restrictions below]
- Interprovincial general inland water transportation; Interprovincial pioneering inland water transportation [connecting remote areas]: Foreign capital ownership: Max.49% [no change;  see 2019 restrictions below]
- Inter-district/intercity general inland water transportation; Inter-district/intercity pioneering inland water transportation [connecting remote areas]: Foreign capital ownership: Max.49% [no change;  see 2019 restrictions below]
- Inner district/city general inland water transportation: Foreign capital ownership: Max.49% [no change;  see 2019 restrictions below]
- River and Lake Transportation for Passengers with Fixed Schedule and Regular Route; River and Lake Transportation for Passengers with Non-Fixed and Irregular Routes; River and Lake Transportation with Non-Fixed and Irregular Routes for Tourism;: Foreign capital ownership: Max.49% [no change;  see 2019 restrictions below]
- River and Lake Transportation for General Goods and/or Animals; River and Lake Transportation for Special Goods; River and Lake Transportation for Dangerous Goods: Foreign capital ownership: Max.49% [no change;  see 2019 restrictions below]
- Port services/provision of harbor facilities (jetties, building, tugs at cargo container terminals, at liquid-bulk terminals, at dry-bulk terminals, and at Roll of (Ro-Ro) terminals; Provision and operation on crossing harbors, Provision and operation of river and lake harbors , Multimode transportation  [see 2019 restrictions below]: Open (without condition) [no longer listed] [...]" (Presidential Regulation (PERPRES) No. 49 of 2021 Concerning Amendments to Presidential Regulation Number 10 of 2021 concerning Investment Business Fields [google translation])
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Previously
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"APPENDIX III - REGULATION OF THE PRESIDENT OF THE REPUBLIC OF INDONESIA NUMBER 44 YEAR 2016 CONCERNING LISTS OF BUSINESS FIELDS THAT ARE CLOSED TO AND BUSINESS FIELDS THAT ARE OPEN WITH CONDITION TO INVESTMENT - 
LIST OF BUSINESS FIELDS THAT ARE OPEN UNDER SPECIFIC CONDITIONS [...]
J. Transportation Sector
- Domestic sea transportation, International sea transportation, Interprovincial general inland water transportation, Interprovincial pioneering inland water transportation,Inter-district/intercity general inland water transportation, Inter-district/intercity pioneering inland water transportation, Inner district/city general inland water transportation, River and lake transportation for passengers with fixed schedule and regular route, River and lake transportation for passengers with non-fixed schedule and irregular route, River and lake transportation for tourism with non-fixed schedule and irregular route, River and lake transportation for general freight and/or animal, River and lake transportation for Special freight, River and lake transportation for Hazardous freight, Provision of harbor facilities i.e., waste reception facilities, Provision and operation on crossing harbors, Provision and operation of river and lake harbors , Multimode transportation: Foreign capital ownership: Max.49% [...] 
-  Provision of harbor facilities (jetties, building, tugs at cargo container terminals, at liquid-bulk terminals, at dry-bulk terminals, and at Roll of (Ro-Ro) terminals: a. Foreign capital ownership: Max.49% b. Subject to a special permits from the Ministry of Transportation for the minimum capital requirement [...] "(PRESIDENTIAL REGULATION OF THE REPUBLIC OF INDONESIA NUMBER 44 YEAR 2016 CONCERNING LISTS OF BUSINESS FIELDS THAT ARE CLOSED TO AND BUSINESS FIELDS THAT ARE OPEN WITH CONDITIONS TO INVESTMENT)
Presidential Regulation (PERPRES) No. 49 of 2021 Concerning Amendments to Presidential Regulation Number 10 of 2021 concerning Investment Business Fields [google translation]
PRESIDENTIAL REGULATION OF THE REPUBLIC OF INDONESIA NUMBER 44 YEAR 2016 CONCERNING LISTS OF BUSINESS FIELDS THAT ARE CLOSED TO AND BUSINESS FIELDS THAT ARE OPEN WITH CONDITIONS TO INVESTMENT
[<a href="https://peraturan.bpk.go.id/Home/Details/168534/perpres-no-49-tahun-2021">PR49</a>],[<a href="https://peraturan.bpk.go.id/Home/Details/161806/perpres-no-10-tahun-2021">PR10</a>],[<a href="https://peraturan.bpk.go.id/Home/Details/40374/perpres-no-44-tahun-2016">PR44</a>]