Signing on with an EEE diploma, you'd most likely be under the
MDES scheme as an Electrical and Control Specialist. There are two
main groups on a ship - the "techs" and the "seamen" - and you'd be
firmly in the former.
As a tech, you'd be spending lots of time in the engine room
making sure things work. The engine room is a noisy, warm and humid
place when you're actually working in it (though you may spend your
watches in an air-con control room when everything is running
smoothly). Expect to have to get sweaty and grimy whenever a job
needs to be done. The upside is that you don't often have to go out
and melt under the sun like the seamen do.
As an ECS you're responsible for keeping electrical systems
running - this means everything from the generators and
switchboards up to fixing domestic lighting, air conditioning and
electrical supplies to weapons and combat systems.
Techs are expected to be at the forefront of shipboard
firefighting and damage control, so expect to train a fair bit in
the DCBA suit (imagine the chemical defence suit, if you've ever
worn that before, but with air tank instead of filter mask).
Like anyone else in the SAF, you have to do duty. This includes
weekends and public holidays. There's also sailing, which may
sometimes burn your weekends and holidays too. When not sailing or
on duty, you will definitely be stay-out.
The high points in a navy career would come from being out at
sea (dolphins, stars, and the like, which as a tech unfortunately
you'd be seeing less of) and shore leave when the ship travels
overseas.