It loads as soon as you power up the unit. You do not have to browse for it,
It will actually overlay the info on the map. Use the arrow keys and move to the closest lake, you should now be able to see the contour lines on the map. This only if the lake is on the map. Not all the lakes are loaded on the card. How do you like the unit? I have one but have never been real impressed with it. I can sit in 10' of water and if anything floats by the unit will start reading 500'. I do like the GPS though.