General

Modern recreational sonar equipment (also called a fishfinder, bottom machine, echo sounder, depthsounder, or just sounder) uses sound waves to look through the water. The sonar device then displays a picture of what’s below the hull of a boat.

Sound pulse. First it sends a pulse of sound down, via the transducer. The sound bounces off objects in the water, like rocks, wrecks, and fish. Second, it measures the time that sound pulse takes to return and uses that information to display a screen.

Sound waves reflect best off objects with densities different than water’s. So rocks, mud, metal, and the air-filled swim bladders of fish all show up well. (There are also side-scanning and forward-scanning sounders, normally found on commercial fishing, military, and research vessels; these are expensive units.)

Whether you use your device to navigate the depths, determine bottom composition or to find those fish, you’ll need to consider some basic questions: Which transducer frequency should I use? How much resolution do I need? How much...

Garmin Forerunners are a popular fitness watch for runners. With many different styles and colours to choose from, it’s easy to see why runners chose Garmin to track their performance.

Product	Forerunner 55	l		Forerunner 255/255s	Forerunner...

Garmin GPSMAP 78, 79 & 86 series handheld GPS units are reliable and portable GPS devices that are suitable for hiking, hunting, ATV-ing or any outdoor adventure.

Some of the key differences between the units in the GPSMAP 78 & 86 series include:

• Internal batteries: the GPSMAP 86 series has an internal rechargeable battery whereas the GPSMAP 78 requires two AA batteries.
• Pre-loaded maps: The “sc” units (GPSMAP 86sc & 86sci) have preloaded BlueChart g3 U.S. coastal charts, the other units have no preloaded maps. All units have the ability to add maps.
• Internal memory: The GPSMAP 78 series has a much smaller internal memory (1.7GB) than the GPSMAP 86 series (16GB). This impacts how many routes, waypoints and tracklogs you can store.
• Photo navigation: The GPSMAP 78 series allows you to navigate to places where you’ve taken photos, the GPSMAP 86 series does not.

Some of the key differences between the...

Are you trucker with a big rig or a camper with an RV? There are devices made just for you! You can tell the device your big rig’s or RV’s measurements, and it will calculate your route so you don’t hit any low overpasses or take you on a super winding road.

The Garmin dezl series was designed with long haul truckers in mind. They offer trucking-dedicated navigation, including custom truck routing and road warnings, all in one durable device.

The Garmin RV series navigators was designed with campers and as name suggests, RV-ers in mind. They offer custom routing, road warnings and a directory of RV parks and services right at your fingertips.

Here’s how these popular RV & Big Rig GPS models are different.

You may also be interested in how the Garmin dezl & RV series compare with the Garmin Drive series.