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Anyone got any ideas on this issue. I'm struggling to understand the differences.

Hi there, I've just bought an Astro 320 and already operate a GPS 62s.

I have a full topo sd map which is loaded into the sd slot of the Astro, I've also built a custom map set for my hunting areas in mapsource. I then send the map set to the unit, go into settings and enable both the preloaded sd topo map and my custom map set.

This is where the problem begins- with both map sets enabled I can only see the custom map (which is poor detail) I want to be able to see an overlay of both? I can disable the custom map and get full functionality of the preloaded topo map but then loose my customised boundaries for hunting exclusion areas......

When following the same process with the GPS 62s I can see all maps in overlay no problems at all.

Any idea why the Astro is different or have I missed something basic?

Appreciate any assistance.

Matt.