Good Portable GPS
The Garmin 76 for less than half the cost is a very good hand-held unit. I have the 76S which can hold 25M of data. I have all of the Chesapeake BlueChart data loaded into it, as well as the three county roads that I routinely travel through, as well as the topo maps of Shenandoah National Park. Moreover, it has a built in compass, can access tide data, and even has a barometer to help predict weather. Best of all, I bought it on ebay for less than what a Garmin 76 retails.
~ Happy sails to you ~ _/) ~