You only get what you pay for!!!
You only get what you pay for!!!
Unfortunately with GPS systems you only get what you pay for so don't be seduced by the claims made by some entry level systems because they invariably lack detail and essential information.
Most GPS systems will require a Navionics or similar data card specific to the UK or indeed our area so be carefull when purchasing from abroad and you will also need to know if it has a built in or external antenna.
I guess it's all down to what you can afford and/or what level of detail you require but in my opinion a good quality GPS system is essential.
I fish inshore ground and offshore wrecks, I do not drift aimlessly and from my GPS database I select undersea features such as reefs, wrecks and ridges. I then consider factors such as wind direction and tidal flow before positioning my boat and I attribute at least 99% of my seasonal catch to my GPS system.
I have a Raymarine C70 but any decent make such as Garmin, Lowrance, Furano, Simrad etc will be ok but be prepared to lay out the stiff end of a grand to acquire a decent system.