Understand the differences

There are three types of GPS Fish finders. Chart Plotter Combos, Track Plotter Combos and Stand Alone Units. Know the difference and avoid the hassle.

GPS Fish Finders are fish finders that have integrated Chart Plotters or Track Plotters. Knowing the differences can save you time and money.

Fish Finder Chart Plotter combos like the Lowrance LMS-332c shown here (often referred to as GPS Combo Units) are fish finders that have an integrated chart plotter. A chart plotter differs from a track plotter in that it has a map that displays with the GPS tracking data. It allows the user to see where they are in relation to different GPS and will also display the track the user has taken.

Fish Finder Track Plotters like the Humminbird 737 shown here, are combination fish finder and track plotter. The track plotter plots the movement of the user and displays it on the screen; it does not have a map and receives the signal from either a GPS or from a GPS receiver that can be purchased. The Humminbird Matrix finders have the ability to receive the GPS signal from a handheld GPS through a NMEA cable. These cables are available to adapt to any GPS that has a NMEA cable.
Both units come in LCD monochrome display or color. Color screens are nice if you have trouble with glare. Of course if you have the funds you should by a stand alone GPS Chart Plotter and a separate Fish Finder. If you are on a budget or do not need the unit more than three or four times a month then the combo units make a lot of since.

Navionics.com - FAQ Section
You can learn more at this site, they have a good FAQ section that will help you understand more about Charts.

GPS Fish Finder Information
More information on GPS and fish finders

Topic Tags: chart plotter, fishfinder, fish finder, gps fishfinder, gps fish finder, humminbird matrix 37, lowrance lms-332c, track plotter