Modern water navigation is impossible to imagine without reliable electronic assistants that provide safety and comfort on the water. Navigation for the boat It is no longer the domain of only large boats, and has become the standard even for compact PVC boats and aluminum motobots. Unlike car navigators, marine appliances must be highly waterproof, ultraviolet resistant and capable of operating in aggressive salty environments.
Choosing the right equipment is not just about buying a gadget, it's about creating an ecosystem that allows you to see the underwater terrain, plot routes with depths in mind, and return to the starting point even in thick fog. GPS receiver or cartplotters can cost not only money, but also the safety of the crew, so the issue of equipment should be approached with the utmost care.
In this article, we will discuss all aspects of maritime navigation, from display types and maps to the nuances of antenna installation, you will learn how raster maps differ from vector maps, why the frequency of screen refresh is important, and how to properly organize the power supply of onboard electronics.
Key components of the navigation system
The basis of any modern system is mapplotter It is a device that combines the functions of a GPS navigator and an electronic mapping tablet, and it is on its screen that the operator sees his location, course, speed and environment. Modern models often have high-brightness touch screens that are readable even in direct sunlight, which is critical on a bright summer day.
The second important element is GPS antennaThe quality of the signal reception directly affects the accuracy of the positioning. Built-in antennas in budget models can perform worse in closed cockpit or overcast weather, so remote antennas with external placement are considered a more reliable solution for serious use.
The third component is often sounderIt's an integral part of navigation, which, although it's used to find fish or explore the bottom, is a warning system for shallows and underwater obstacles. Many devices combine the functions of a cartplotter and a sonar, which saves space in the cockpit and makes installation easier.
- 🌊 Display: It must have anti-reflective coating and a resolution of at least 800x480 for a clear display of map details.
- 📡 Receiver: Support for simultaneous operation with GPS, GLONASS and Galileo systems ensures maximum accuracy.
- 🔌 Interfaces: The presence of NMEA 0183/2000 ports allows you to connect external sensors, radars and autopilots.
⚠️ Warning: Never rely on electronic navigation alone. Always carry paper maps and a compass with you, as electronics can fail at the most inopportune moment.
When buying a cartplotter, pay attention to the brightness of the screen in the filaments. For marine use, this parameter must be at least 1000-1500 nits, otherwise in sunny weather you will only see your reflection.
Types of navigation charts and their features
The effectiveness of navigation depends on the quality of the maps used, and there are two main types of digital maps: raster and vector maps. Raster cards These are scanned images of paper maps that look familiar and contain all the detailed information, but they don't allow you to zoom in without losing quality and they can't automatically rewire the route.
Vector maps They're built mathematically from points and lines, so you can scale them without losing clarity, and the main advantage of vector maps is interactivity: you can hide or display certain layers of information (e.g., depths or navigational signs), and you can also get audible warnings when you approach a danger.
For Russian water bodies, the most popular maps from Garmin, Navionics and domestic developments, such as the "Maritime Navigation Maps" (MNC). The coverage of the inland waterways of Russia from foreign manufacturers may be less detailed than that of local developers..
| Characterization | Raster cards | Vector maps |
|---|---|---|
| Scaling | Loss of quality (pixelation) | Without loss of quality |
| File size | Large data volume | Compact size |
| Interactivity | Missing. | High (layers, search) |
| Routing | Hand-layer | Automatic gasket |
Where to download free maps?
There are open data resources, such as OpenSeaMap, but their accuracy and relevance are not always guaranteed.
Criteria for choosing a cartplotter for a small vessel
When choosing a small boat, the key is the screen diagonal and ease of operation. For a PVC boat or a small boat, the best choice is a model with a diagonal of 5 to 7 inches. Larger screens are certainly more informative, but they take up a lot of space and require more energy.
The important aspect is the type of control, button or touch. mapplotters It is more reliable in the rain and when you wear gloves, while touch-sensitive ones provide a more intuitive interface, similar to a smartphone. Some manufacturers offer hybrid models that combine both types of controls.
You also need to pay attention to the speed of the device's processor, because cheap models can take a long time to "think" when redrawing a card while driving at high speed, which creates dangerous situations. Frequency of update The screen should be high so that the cursor does not “lag behind” the real position of the boat.
- 📏 Diagonal: 5-7 inches is the gold standard for small craft, 9+ inches for chopping boats.
- 💧 Defense: mandatory IPX7 or higher, salt fog resistance.
- 🔋 Energy consumption: It is critical for boats with a small battery capacity.
Installation and installation of navigation equipment
The right installation of equipment is the key to its long and trouble-free operation. The first step should always be to choose a place to install the head unit. It should be in the field of view of the helmsman, but not to block the view and not interfere with the control of the boat. Open cockpits often use rotary brackets to remove the device in the parking lot.
Installation GPS antennas The antenna must have a direct view of the sky (360 degrees on the horizon); the placement of the antenna under a metal awning, near the mast or in niches will lead to loss of signal; the minimum distance to other emitting devices (radio stations, radars) must also be observed to avoid interference.
Electrical connection must be made through a safety lock, installed as close as possible to the power source, all connections must be carefully isolated and protected from water, using thermal shrinkage and special marine sealants.
☑️ Check before the first launch
⚠️ Warning: When laying cables, avoid places where they may be rubbed by moving parts or damaged by sharp edges of the fiberglass case. Use corrugated or cable channels.
Integration with sonar and additional sensors
Modern boat navigation rarely does without a sonar, and the integration of these devices allows you to put data on the depth and topography of the bottom directly on a map, creating what is called a "deep map," which is especially useful when passing through unfamiliar fairways or when searching for fish places.
Connecting external sensors, such as a speed (lag) or water temperature sensor, extends the system's functionality. Water speed data (as opposed to GPS speed) allows for more accurate drift and fuel consumption calculations. For anglers, a temperature sensor that helps find thermoclines is critical.
Protocol for data exchange NMEA 0183 more modern NMEA 2000 It allows you to connect devices from different manufacturers into a single network, which allows you to, for example, output data from the Garmin cartplotter to the repeater in the tiller or broadcast information to the tablet.
Using a single NMEA 2000 network simplifies installation, as it requires fewer wires and allows multiple sensors to be connected via a single backbone cable.
When setting up the sonar, it is important to choose the right frequency of the emitter. Low frequencies penetrate deeper, but give a less detailed picture, high frequencies are ideal for shallow water and detailed study of the structure of the bottom.
Electricity and electronics maintenance
Stable voltage is the basis of marine electronics. Power surges when starting an outboard motor can disable the sensitive boards of the navigator, so it is recommended to use voltage stabilizers or connect navigation through a separate battery, if the design of the vessel allows.
Regular maintenance includes washing contacts with fresh water after each outing (especially after salt water), checking the mounts for vibration and cleaning the screen with special wipes. Aggressive chemicals to wash the windows of cars can damage the anti-reflective coating of the display.
And let's not forget about software updates, because manufacturers periodically release firmware that improves GPS speed and fixes errors, and software updates are a simple procedure that can be done by uploading a file to an SD card.
- 🔋 Battery: Keep an eye on the level of charge, deep discharge is destructive to the battery.
- 🧼 Cleanup: Use only soft fabric and water, avoid solvents.
- 🔄 Update: Check for new versions before the navigation season.
⚠️ Warning: Do not leave removable navigation parts (heads, antennas) on the boat for winter storage without protection. Temperature swings and condensation inside the hull can cause corrosion of contacts.
Frequently Asked Questions (FAQ)
Do I need to register a cartplotter in GIMS?
Navigation equipment itself is not subject to registration, but if you install a stationary radio station in the sea range, it requires registration and receipt of a call sign.
Does navigation work without the internet?
Yes, it works. GPS is received directly from satellites and does not require Internet access, maps must also be downloaded to the device's memory in advance, and the Internet is only needed to update maps, weather or online services.
How often do I need to change cards?
It is recommended to update the maps once a season or when there is information about changes in the fairway. In waters with active dredging or changing terrain (estuaries, tidal zones), the relevance of data should be checked more often.
Can I use a smartphone instead of a cartplotter?
You can, but with limitations. Smartphones don't have proper moisture protection, their screens don't read well in the sun, and the GPS module is less accurate. Use them only as a backup for navigation in a sealed case.