Garmin BlueChart g2 extra .img files

Good on ya for making Garmin honour their New Chart Guarantee .
My older Charts ,East Coast Australia VPC022R for example are just 1 img file.
The later G3 versions I have seem the have 4 .img files ,the map Id's are different. I don't have a chart plotter ,but maybe they are Chart layers only available on more

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Garmin_Nuvi Reviewed by Garmin_Nuvi on 29th January 2022. Garmin BlueChart g2 extra .img files I just bought a new GPSMap 78sc and it comes with Garmin's New Chart Guarantee. After a month of arguing with Garmin support they finally added the 2022.0 g2 map to my express account. When I download it there are four .img files from 1Gb->1.5Gb. Only one of the .img files shows up as a chart in Homeport. What are the other .img files for? Are they routing information? Rating: 5