Previous maps I have made have been limited to about 50m maximum depth. I've been using at5 colours with 26 different colours. Using a fixed depth palette this gives me a different colour every 2 metres which makes a useful map.
I've recently started mapping a different area. This is a deeper area (I'm now up to 70m max). So I've thought about using the RGB palettes. Editing the palettes is a bit of a problem. I've tried editing a RGB palette with 26 colours but RM2 won't let me.