"User card format unknown" appears on a Garmin GNS 400/500 GPS
Created Date:
Feb 2025
Article ID:
000002025
Version:
1
Environment:
Avionics System/GPS
Document Type(s):
--
Related Products: --
PROBLEM:
The following message is displayed on a Garmin GNS 400/500 GPS: " User card format unknown "
CAUSE:
Incorrect card inserted in unit, such as inserting a non-WAAS card into a WAAS unit, inserting the NavData card into the right-hand slot where the user data or TAWS/TERRAIN DATA card should be inserted, or if using a new orange-label card in a unit that does not have v3.30 or later software.
RESOLUTION:
Insert the correct card into the left slot with the label facing left (GNS 400) or facing up (GNS 500). If using an orange-label card, update the software of the unit to v3.30 or later. Refer toGarmin Service Advisory 1455 Rev A for more information.