Hi
Money and the fact I can barely justify GPS for my sailing mean I go for a similar solution to Martyn, a Garmin GPS 72. Its bulky compared to a land-use GPS but an affordable toy (around £80 if you shop around), capable of doing the proper job if I needed it to. A “serious” cruiser might justify a mapping GPS but since you should always have paper charts in case of GPS failure…..what’s the budget?!
Dave