Think back to your arithmetric classes in elementary school, then math later on. Were you allowed the use of calculators to learn the basics? This analogy holds true to navigational aids. Based upon your question, I can assume that you may not know how to plot routes & courses on paper charts. This is absolutely essential knowledge for anyone planning an extended cruise, whether it's just a couple hours or much longer.
Buy some NOAA charts for your area, take a course in plotting with your local USPS or USCG and plot your route directly on the charts. If you have the money now, pick up either a handheld GPS chart plotter, or preferrably a fixed mount unit with a large LCD display and appropriate chart chips for your region. Then you can confidently sail to any destination, having knowledge & redundancy.
True Blue . . .
sold the Nauticat