It means you need to search for a better map. Unless it is a very small lake, most lakes have been graphed so you can at least see basic contour lines. Keep in mind, not all maps are accurate.
No, you have to purchase the mapping card. If you have 2 Helix units you would need a card for each if you want mapping on both Units. Solix units however will share mapping card information.
what if the lake is all blue with no contour lines what dose that mean?
It means you need to search for a better map. Unless it is a very small lake, most lakes have been graphed so you can at least see basic contour lines. Keep in mind, not all maps are accurate.
Can this map information be transferred from your phone onto a helix unit?
No, you have to purchase the mapping card. If you have 2 Helix units you would need a card for each if you want mapping on both Units. Solix units however will share mapping card information.
great video