I'm just wondering the format needed for waypoints to get them ready for transfer by SD card.

I have all my points in an excel spread sheet, do I just copy the spread into the SD card and then insert in the GPS and do a transfer, will the unit pull the points from the sheet ??

The unit is a Humminbird 998.

My old plotter ( Garmin 172C ) has died, luckily the waypoints were stored and saved to the garmin data card. I used mapsource to manage the points, but not sure in the Hbird will be as user friendly.

This question has no doubt been addressed previously. Thanks in advance