Launching at Southey Point is not the easiest and is only marginally better at a similar spot at the road end just to the west. A better launch site is near Hudson Pt. to the south on the east shore. Parking is very limited at all three locations.
The tidal currents are not pronounced in that portion of Trincomali Channel but if the weather is clear and hot beware of strong northerly winds. Early morning and late evening offer the best conditions for crossing if the high pressure system creating these conditions is apparent.
I hope that this helps.