The ornamental design for a marinedevice, as shown and described.
FIG. 1 is a front perspective view of a marine device according to the present invention;
FIG. 2 is a rear perspective view of the marine device;
FIG. 3 is a front view of the marine device;
FIG. 4 is a rear view of the marine device;
FIG. 5 is a top view of the marine device;
FIG. 6 is a bottom view of the marine device;
FIG. 7 is a left side view of the marine device; and,
FIG. 8 is a right side view of the marine device.
The structural features depicted by broken lines have been shown for the purpose of illustrating portions of the marine device that form no part of the claimed design.