The National Archives has recently released over 600 Navy Ship Log Books, most are of Civil war vintage to about 1907. The log books are in cursive handwriting so don't expect them to be easily read.
below is the the address
There are also Navy muster rolls that have been put on-line
The muster rolls of the US Coast Survey Steamer A D Bache 1871-1879 has a number of men that enlisted in Delaware and Maryland.