I don't know about the Luhr, but I'd go with a GPS over anything else. GPS is uneffected by waves, water current, wind, etc. and is a whole lot more accurate. The down side is that a GPS costs more. But the cheapest new GPS is going to run about $95, about double what the Luhr costs. But for that extra $40, you'll get the ability to mark good spots and return there again and again. And it will be useful for hiking and finding your car in those huge parking lots.