Garmin BlueChart g2 extra .img files

They weren't happy about it - especially when they saw I only paid AU$130 each for four of the 78Sc (also got a couple of Montana 610 for AU$205) - bargain - price error

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Turns out they are the g3 maps and Garmin sells the maps alone for AU$240.

I've got a GPSMap 8610XSV + 7410XSV + panoptix livescope in my boat and the extra .img appear to be routing for auto pilot.

iratepirate Reviewed by iratepirate 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