If you are looking for a Christmas gift, why not give them a GPS? There are many GPS instruments for sale at prices to suit all buyers. Whether it is a simple hand held GPS that can be carried around in your pocket or the larger more sophisticated type.
If the person you are buying the GPS for already has one, then perhaps they would welcome an upgrade. For example, from a hand held GPS to one that is fixed within their boat. If you know the layout of their boat you might have a fixed position in mind for your new Christmas gift?
Sourcing your GPS can involve one of several routes. You could visit your local chandlery to view a suitable GPS. This is quite a good way of deciding which one would make the ideal Christmas gift. It also may be an opportunity to see one in action before you buy. However, once you have identified the GPS model you want, you do not necessarily need to buy it then and there.
You could return home and spend sometime surfing the internet for other sources of that particular model of GPS. There are online chandlers, retailers, Amazon or ebay, that may have your gift in stock. Some online sources such as ebay have the facility to deliver the GPS to your nearest Argos for you to collect when it is convenient.