Dear Mr. Mentrasti,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the Logbooks of U.S. Navy Ships and Stations, 1941 - 1983 in the Records of the Bureau of Naval Personnel (Record Group 24) that include the deck logs of the YMS-418 for 11 October 1944 through 20 November 1946. For access to and/or copies of these records, please contact the National Archives at College Park - Textual Reference (RDT2) via email at firstname.lastname@example.org.
Due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgment as well as a substantive response to your reference request from RDT2. We apologize for this inconvenience and appreciate your understanding and patience.
We also located World War II War Diaries, Other Operational Records and Histories, ca. 1/1/1942 - ca. 6/1/1946 in the Records of the Office of the Chief of Naval Operations (Record Group 38) which contains war diaries concerning the YMS-418’s activities during World War II. These records have been digitized and can be viewed online through the Catalog. Plus, the record series Monthly War Diaries, 3/1942 - 8/1945 in the Records of Naval Districts and Shore Establishments (Record Group 181) contains at least three diaries with references to the YMS-418 that have been also digitized and may be viewed online through the Catalog. Please note that the Catalog does not always list files in chronological order.
In addition, we searched the website of the Naval Heritage and History Command and located a photograph of the YMS-418. Finally, we located some information about YMS-418 on the unofficial website NavSource.
We hope this is helpful. Best of luck with your family research!