Yes, but in your situation there I would be waiting for pretty much no wind or at least a light offshore wind blowing away from you to the target . . . might take a while but those perfect (no) storm days do occur from time to time.
Read up here on the forum and be aware of how ocean winds and flying home or RTH (manual or auto) can cause loss of aircraft.
Is it a mile ? That is 1.6km and with good LOS for signal should be a cake walk.
Use a take off point somewhat elevated above sea level (ASL) to help signal at distance.
I would keep the
M2P up fairly high as it got further away near the target, just to be sure you keep signal and full control.
Change RTH settings to a suitable height . . . if flying from a reasonably high vantage point (say for example a cliff edge 15m about sea level, then say 10m RTH altitude should be more than ample.
If you are higher than that over the target, and you lose signal / RTH kicks in, it won't descend, but stay at your current altitude.
As it comes back over the ocean, you can then bring it down manually to a safe height (out of possible increased higher wind speed).
In the example above this would be 25m (~ 80') ASL.
It'll be a bit nerve racking for you, so maybe try some other shorter such trips first . . . the Isle of Wight isn't going anywhere soon ?