Tip: Layer 3 backgrounds and tides disappear when you hit a message box, so plan your level around that. For example, you can add a sublevel without layer 3 at the start/midpoint, and include your message there.
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Details for LM Map16's Custom Block Code and Hijacks
Documents - LM Map16's Custom Block Code and Hijacks
If you are interested on updating GPS to adopt with the map16 expansion, it uses a separate table: address $06f623+1 contains the map16 for pages 0-3, while $06f639+1 contains map16 for pages 4-7 (note that the minimum index value there is $8000). These are the behaviors table.