I don’t have any recommendations for you, but do have two points to consider when you come to selecting them:
1. Navigating for sail and powerboat are subtly different. In many ways powerboat is far simpler (you can mostly ignore the difference in speed through the water and over ground; leeway is minimal; wind direction is obviously much less significant; and certainly for ribs no huge keel (or mast) to stress about depth and bridge heights etc.). But doing your navigation planning and execution at potentially 6-10x the speed is much harder.
2. Navigating on a small open boat is very different from navigating at a chart table or in a class room. Yes it’s useful to have a fall back position of paper charts but real life RIB nav is now about using a plotter to maximum effect, and having strategies to cope if it fails. Trip planning can be easier on real charts spread out on a table though.
So make sure you know what it is you want to learn - and always keep in mind - how am I going to use this on my boat.
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