Note that a Fishfinder is not a GPS receiver, but a sonar device used to read the bottom structure of marine geography, determine depth of water, and spot fish.
Can the global positioning system save you from such an ignominious fate? Perhaps: I've found that a GPS receiver keeps me on track and, in the event of a misstep, gets me back to where I need to be.
GPS on the road : Recycle all the maps in your glove box and put a GPS device in your car. ... How many transactions have they completed? What percentage of positive responses do they have?