Navigating Innamincka to Birdsville via Walkers Crossing - how difficult?

I take off from the GC on April 4th on a Birdsville and back trek with a couple of mates. We're taking it slowly and won't be in Innamincka until the 8th. From here we can go to Birdsville via Cordillo Downs (been there, done that more than once) or go via Walker's Crossing onto the Birdsville Track. The latter is the shorter route (though not necessarily as far as time goes but I suspect it is).

I remember reading on a couple of websites that you can get lost in this area if you're not careful so I'm not sure if this is necessarily a wise option. I've crossed the Simpson, transversed the country, through the middle, from west to east etc so I'm not afraid of a challenge. My vehicle is well equipped.

Any advice, previous experience, GPS way points etc you could give me would be helpful. I have a Tevion GPS navigator but it doesn't do GPS waypoints and I don't know if it would take any of the outback maps you can get on an SD card. I can get a very basic GPS navigator (waypoints and route only in black and white - it's a very old Garmin) from work and wonder if I can utilise this. It worked a treat in the Simpson in telling us, in waypoint code, where we were, how high we were, etc.

All help, advice and previous experience would be appreciated. The other thing at the back of my mind is that the recent rains may eventually take Walker's Crossing out of the equation anyway.

Cheers

Holden4th