Hi.
I recently purchased a boat that came with an echoMAP SV CHIRP 92 device.
I downloaded garmin express, added the device there from the micro-sd card that was in the device.
I was then able to download WorldWide Shaded relief map 2020.50 v9.00, it also displays QuickDraw Contours Starter Map Version: 2018.0
When i put the sd-card back in my Plotter i was given the option to transfer from sd-card, which i did. There the plotter also listed the following map in addition to shared relief from 2020s:
HXEU041R-Oslo-Skagerak-Haugesund v2016.0 v17.50
HXEU041A-Oslo-Skagerak-Haugesund v2016.0 v17.50
How can i make my Garin Express see that i have had these norwegian maps from before, and provide updates to them? (Not sure if they can be updated directly, but i have heard that there is a discount for map updates on maps you allready own)