Garmin GNC 355 Pilot's Manual page 163

User Waypoint File Considerations
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Limit one waypoint per row
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Names may be up to six characters in length
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Comments may be up to 25 characters
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All letters must be upper case
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Latitude: two digits left of decimal; up to nine digits right of decimal
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Longitude: three digits left of decimal; up to eight digits right of decimal
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(-) indicates southern latitudes (column C) or western longitudes
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Express latitude and longitude coordinates in decimal degrees
Save the file in the .csv format under the name "user.csv." Change the file extension
to ".wpt" before copying the file to a blank SD card.
IMPORT USER WAYPOINTS
1. Ensure that the unit power is off.
2. Insert datacard containing user waypoints.
3. Power on unit.
4. From the Home page, tap Waypoint Info > Import Waypoints.
5. Acknowledge the pop-up message.
The import function executes in the background. Once the import is complete, an
advisory message informs: "User waypoints were imported successfully."
The waypoints are now available for use. You may power down the unit and remove
the SD card.
If an imported waypoint is within 0.0001 degree (latitude and longitude) of an
existing user waypoint, the existing waypoint and name will remain in use.
190-02488-01 Rev. B Pilot's Guide
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