[mezz]

There’s one more factor that needs to be taken into account when determining just how far your radar will be able to spot things: the curvature of the earth. Because we can’t bend the horizon or the microwave beams we send out over it, the combination of the height of your radar antenna and the height of the target you’re looking for will always limit just how far your radar can see. Here’s the formula that expresses the relationship between the height of the target and height of the radar antenna: here

[baitzor]

Once the radar antenna “sees” a target, it can display the strength of the return –which is not necessarily the same as the object’s size – on-screen. more

[dkaparis]

No matter how powerful your radar may be, and no matter how narrow its beam width, it will never be able to see beyond this mathematical calculation. here

[kytradersclassifieds]

The boat’s course has to be determined relative to your own. The simplest way to do this is to put your own boat on a 90-degree angle to the target, look at your course line, and add 90 degrees when approaching from port or subtract 90 degrees when approaching from starboard to get its course over the ground (COG). Allow a few minutes to pass and repeat the process several times, to get a firm idea of which way the target is heading. Remember, it's the relative bearing to the target that counts. If the relative bearing stays the same and the range is decreasing, then the potential for a collision is increasing.

[snrlx]

(1.22 nautical miles x square root of height of radar) + (1.22 nautical miles x square root height of target) here

[ninaheadley]

4. Double echoes: These happen when the radar signals bounce off some parts of the ship and back into the receiver. more

[Loki]

3. Distorted coastline: When a vessel is approaching a straight coastline, the radar may report a curved coastline or vice versa. This is because of the distance the radar takes to reach and return to the receiver from areas that are further away from the centerline of the vessel. [links]

[wolfz0rz]

Marine radar is a radar that is mounted and used by ships at sea for collision avoidance and other uses. It is used to detect other ships at sea and any other land obstacles. It is one of the most important safety components at sea and near the shores. But like all radar systems, marine radar has its own limitations and errors. Below are some of the errors and limitations.

[gkelly]

1. Index error: This is the difference between the actual range between two points on a map and the range detected by the radar. This error can be observed when the vessels seat abeam between two points.

[Stahovec Jeffrey]

Pulse compression radar with 20-inch dome antenna, 24nm range, radiation free. [links]

[benderamp]

Lowrance’s line of Marine Radars gives you the clearest picture of the surroundings for safe navigation in conditions of limited visibility. The line of radars is easy-to-use and is ideal for any fishing boat. more

[hook]

Lowrance has forever changed boat radar with real-time imaging from their line of Broadband and Pulse Compression Marine Radars. More than boat weather radars, Lowrance offers expanded capabilities to deliver clear and precise imaging on high-definition HDS displays of shorelines, navigation buoys, floating debris, current weather conditions, marinas and other structures along with boats from large ocean going vessels to small low-to-the-water kayaks.

[Pogo]

Pulse compression radar with 20-inch dome antenna, 36nm range, 60 RPM operation and VelocityTrack. here

[genjix]

Our revolutionary HALO pulse compression dome radars deliver industry-leading 360-degree sweeps every second at close range, for the ultimate in collision avoidance of stationary and fast-moving targets. With high-quality short, mid and long-range detection, these feature-packed dome antennas ensure targets can be seen vividly - even in the toughest environmental conditions. here

[jlebeau]

Pulse compression radar with 24-inch dome antenna, 48nm range, 60 RPM operation and VelocityTrack. here

[mjmvisser]

Lets you see the icons of other vessels detected with your Automatic Identification System receiver on your radar scope. To use this feature, you will need to have a suitable AIS receiver or transceiver connected to your multifunction display.

[johnyh]

Shows the historical path taken by moving targets on the radar scope. The live target will display in its primary color, while its path or wake will remain visible behind it for a selectable period. This allows you to more easily see targets in motion and determine their direction of travel across the radar scope.

[emmamarko112]

The choice of mid to large-sized powerboats and sailing vessels, open array radar scanners deliver higher sensitivity, better target detection and improved target separation. Open array systems are available with 4kW or 12kW transmitters for exceptional performance at all ranges.

[oUmber]

Open-Array radar scanners are made of 2 parts. The radar pedestal houses the scanner’s electronics and drive mechanism. Atop the pedestal is mounted a radar antenna or array. Raymarine’s Magnum Open Array radar scanners consist of pedestals with 4kW or 12kW power output, and your choice of a 4-foot or 6-foot antenna array. here

[pmw]

Think of multifunction displays, commonly called MFDs, as the “brain” for your boat. They incorporate most or even all of your systems into one single interface, which may feature either a touch screen or keypad control.

[splitpeamaster]

Engine monitors provide you with digital gauges like tachometers, fuel level, and engine temperature. Once again, this functionality may come through your MFD or you may have dedicated screens to show you nothing but engine data. In this case, however, having dedicated screens is more common because you’ll want to be able to monitor your powerplants whenever they’re running. [links]

[mcjohn]

They may have touch-screen or tactile interfaces, and generally have a number of settings that can improve performance quite a bit depending on factors like water depth, the level of suspended solids in the water, zoom levels, and so on. Fortunately, all modern fish finders have “auto” modes that can do most of the fine-tuning for you. here