# Master OSV Upgrade **URL:** \ **Category:** Professional Mariner Forum\ **Created:** [October 11, 2008, 1:16pm UTC](https://forum.gcaptain.com/t/master-osv-upgrade/555 "2008-10-11T13:16:04Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Rusty](https://avatars.discourse-cdn.com/v4/letter/r/f17d59/32.png) [@Rusty](https://forum.gcaptain.com/u/Rusty)\ **Post date:** [October 11, 2008, 1:16pm UTC](https://forum.gcaptain.com/t/master-osv-upgrade/555/1 "2008-10-11T13:16:04Z")
This is an NMC question for James Cavo or anybody else that may have been through this upgrade route. At present I hold a 100 ton master n/c license and meet the qualifications for Master OSV according to 46 CFR Part 10.418. After completing the onboard assessments and training for Mate and Master OSV can I test for Master OSV without first testing for Mate OSV. Any input would be appreciated. ---
**Author:** ![guest1](https://avatars.discourse-cdn.com/v4/letter/g/ecccb3/32.png) [@guest1](https://forum.gcaptain.com/u/guest1)\ **Post date:** [October 11, 2008, 11:12pm UTC](https://forum.gcaptain.com/t/master-osv-upgrade/555/2 "2008-10-11T23:12:52Z")
You are upgrading your master license as opposed to starting from scratch. Therefore, you do not have to get you mate license first. If you happen to be lucky enough to serve time on a vessel over 500t you will wind up with a 500t Master/1600t Mate. ---
**Author:** ![guest1](https://avatars.discourse-cdn.com/v4/letter/g/ecccb3/32.png) [@guest1](https://forum.gcaptain.com/u/guest1)\ **Post date:** [October 11, 2008, 11:17pm UTC](https://forum.gcaptain.com/t/master-osv-upgrade/555/3 "2008-10-11T23:17:11Z")
You willhave to put in the appropriate number of days on a vessel over 200t at a minimum, to get your AB as well as the required amount of time for your upgrade. You can’t get a higher tonnage license without the AB. You will Also be required to comply with STCW requirements for whatever license you are going for.