Thinking of pulling the trigger to buy --- I currently have a bird 383 CI this unit will not save waypoints - says it has to have the map card , probably with micro chip --- however the book says this unit will save waypoints -- reading online the Helix w/ side imaging does say the same thing and it has Unimaps installed ... and a SD Card slot ... Does uni- maps show Contour lines or do I still need to buy the Map card for this Region