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Why am I not able to see any bathymetric data (fishing charts) when using a BlueChart g2 Garmin Data Card?

Garmin BlueChart g2 mapping offers a detailed map called Fishing Charts that offers bathymetric data (contour lines) of the area covered by the mapping card. This feature is only available on BlueChart g2 SD cards.

All Wearables & Smartwatches
Music
Activity Tracking
Watches for Women
Fashion & Hybrid Smartwatches
Running Watches
Outdoor Watches
Multisports & Triathlon Watches
Swimming Watches
Diving Watches
Golf Watches
MARQ Luxury Watch Collection
Discontinued

BlueChart g2 Garmin Data Cards do not offer the detailed bathymetric data as the devices that are compatible with the Garmin Data Cards do not have the ability to switch to the Fishing Charts mode.