Easiest (and most expensive) way would be to set up a second station at the rear of your boat. That would mean a second unit mount (MS-700E), power cable (PC-10) and either a second transducer (XNT-9-DI-T) or a Transducer Switch (TS3).
You may be able to install your unit such that there is enough wire length to use a RAM type mount with two bases and just move the unit with its mount and wiring connected from one location to the other. More of a chance of tripping or snagging the cables this way though.