My Dad and I are looking for a depth finder/GPS that can add specific navigation points to its memory for future use. For example, we tend to use fishing guides from time to time to learn new spots on lakes that surround our area. It can be difficult remembering every spot a fishing guide takes us too, so we are looking to find a product where we can drop pin a location while we are with a guide, so we can pull up the exact coordinates when we are on the lake by ourselves, without the guide. If anyone has any recommendations or links to products that has this feature, it would be greatly appreciated. Not looking to spend too much for it, but can be flexible.