Size of the number GIMS on the boat: requirements of GOST and rules of application

Every owner of a small craft, whether it is a PVC inflatable boat or a solid boat with a rigid hull, faces the need to register with the State Inspectorate for small craft (SIMS). After successfully passing the procedure and obtaining a boat's ticket, the boat owner faces the practical task of putting on board a registration number. It would seem difficult to just write numbers? However, this is where many nuances lie, the failure to comply with which can lead to administrative fines and detention of the vessel during the inspection of documents on the water.

The main document regulating the technical requirements for the side numbers is GOST R 51871-2001This standard clearly defines not only the dimensions of the symbols, but also their proportions, font, and permissible places on the hull. Many water-engines mistakenly rely on old rules or use stencils found on the Internet, which often do not meet current standards. It is important to understand that the inspector of the GIMS when inspecting the vessel will be guided by a literal reading of the standard, not by the convenience of the owner.

In this article, we will take a look at all aspects of small boat markings, learn the exact sizes of letters and numbers, the requirements for background contrast, and get answers to frequently asked questions about how to apply a number on different types of boats. Proper design of documentation and the appearance of a vessel is not just bureaucracy, but the guarantee of your safety and tranquility during the voyage.

Standards of sizes and font according to GOST R 51871-2001

The basis for the correct application of the hull number is the state standard, which was adopted to unify the appearance of small craft. GOST R 51871-2001The height of the hull number must be at least 100 millimetresThis is a minimum requirement that guarantees the number can be readable from a distance, which is critical for the identification of the vessel by rescue services or law enforcement in reduced visibility.

The width of the characters is also strictly regulated and depends on their type: for digits, the width should be 60 mm, and for letters - 80 mm. The thickness of the font lines is set within 10-15 mm. The use of arbitrary fonts, such as handwriting style or decorative variations, is not allowed. The font should be straight, without serifs and slant, as easy as possible to perceive.

• 📏 The height of the symbols is strictly 100 mm, reducing the size is unacceptable.
• 🔤 The width of the figure is 60 mm, the width of the letter is 80 mm to comply with the proportions.
• 🎨 The font lines are 10 to 15 mm thick to ensure clarity.

Proportion is key. If you choose to stencil yourself, you need to maintain the height/width ratio precisely. Distortion of proportions, such as stretching a figure horizontally to save space on board, is a violation. The inspector may request that the markings be redesigned if they do not match the approved samples, which will entail additional costs for materials and time.

Composition and structure of the onboard number

A small vessel registration number is not a random set of characters, but a strictly structured code that contains information about the region of registration and the type of vessel. It consists of letters and numbers separated by a hyphen. The format of the number is as follows: letter part (series), numerical region code and control letter. Understanding the structure will help you avoid errors when ordering stickers or stencil.

The letter part usually consists of two letters, followed by a three-digit numerical code indicating the region of the Russian Federation where the boat was registered. After the numbers, another letter is put. All characters must be made in the same style and size. It is important to note that the use of letters similar to numbers (for example, "O" instead of "0") can lead to confusion, so official documents use the standard Latin or Cyrillic alphabet approved by GIMS.

What do the letters in the GIMS number mean?

The first two letters are a series assigned in alphabetical order; the numbers after the letters are a region code (e.g. 77 for Moscow, 78 for St. Petersburg); the last letter is a control symbol that helps check the correctness of the entry on the boat's ticket; in some old numbers, the structure may have differed, but new ones are issued according to a single standard.

When you apply the number on board, you must follow the order of the characters, an error in even one digit or letter is equivalent to no marking. The boat's ticket number is exactly specified, and any discrepancy on the hull will be considered an administrative offense. So before starting the marking work, double-check the data in the documents three times.

Color and contrast requirements

One of the most important requirements of GOST is to ensure a high contrast between the color of the signs and the background on which they are applied, the number must be clearly visible at any time of the day and in different weather conditions, this requirement is dictated by safety reasons: in an emergency, rescuers should be able to quickly identify the vessel.

The color of the signs is chosen depending on the color of the boat's side. If the board is dark (blue, black, dark green), the number must be light - white or yellow. Conversely, dark signs - black or dark blue - are used for light hulls (white, light gray).

⚠️ Attention: Do not use camouflage colors in the place of application. If your side is painted in "camouflage" or has a complex pattern, you must allocate the room to the number with a solid contrasting rectangle (background plate), on which the symbols will already be applied.

The material from which the number is made also plays a role: the paint should not be washed away by water and burn out in the sun for one season. If you use stickers, make sure that they are designed for use in an aqueous environment. A faded, faded or partially unstuck number can cause a comment from the inspector, as he ceases to perform his function of identification.

Rules for hull accommodation

The place of application of the hull number is strictly defined by the regulations, according to which the number must be located on both sides of the vessel, at a distance of 1/4 of the length of the hull from the forehead (nose), a standard position that allows easy reading of information when the vessel is bypassed by an inspector or when visually inspected from the shore.

The rules are the same for PVC inflatable boats, but they have their own features of installation. The number should not interfere with boarding and disembarking passengers, or working with oars or engines. Often, PVC boat owners shift the number just below the cylinder, on a rubber bulge, if the design of the boat allows, the main thing is that the number was applied to a hard or strained surface, without folds that could distort the symbols.

On metal and fiberglass boats, the number is usually painted or glued directly onto the boat. It is important to choose a flat area free of structural elements, railing posts or portholes. The height of the lower edge of the signs above the water also matters: the number should be visible when the vessel is under load (with people and equipment on board).

Features of marking for PVC boats and catamarans

Inflatable vessel owners often face a dilemma: how to apply a number without damaging the material or impairing its tightness. The use of aggressive solvents for PVC paint is prohibited, as they can destroy the structure of polyvinyl chloride. The optimal solution is specialized self-adhesive vinyl stickers or stencils using soft water-based paints designed for fabric and rubber.

Catamarans and hard bottom inflatable vessels (HBVs) are subject to the general rules, but with adjustment for design. If the catamaran has inflatable tubes, the number is applied to them. If the design allows, the number is duplicated on the frame or rigid elements, but the number on the inflatable part is considered the main one, since it identifies the vessel as small. On a hard bottom, it is not recommended to apply the number due to rapid abrasion.

• 🧪 Use only specialized adhesives and PVC paints that do not contain acetone.
• 🌊 Consider the deformation of the cylinder: the number should not crack when blowing and inflating the boat.
• 🛡️ After application, it is recommended to treat the number with a protective varnish to increase the service life.

There is a common mistake when PVC boat owners stick a number onto the inside of a cylinder or hide it under the seats, which is a gross violation. The number should be external and accessible for inspection without having to disassemble the vessel or take out the equipment. The inspector does not have to ask you to unload the boat to check the number.

Liability and penalties for violations

Ignoring the rules of marking small craft entails administrative liability. According to the Code of Administrative Offences (Cao of the Russian Federation), the management of a vessel that is not registered in the prescribed manner or a vessel that has not passed a technical inspection, as well as a vessel that does not have visible registration plates on board, entails a fine.

The fine may vary, but is most often between 500 and 1000 rubles, but if the violation is considered more serious (for example, the absence of a number in conjunction with other violations), the amount may be increased, and in the worst case, the boat may be detained and placed in a parking lot until the violations are corrected, this will entail additional costs for evacuation and storage.

In addition, the lack of a properly marked number can cause problems in the event of an insured event, the insurance company has the right to refuse payment if it is proved that the vessel was not properly identified or was in a malfunction (which may include violation of the marking rules), so compliance with the formalities is primarily to protect your interests.

Table of correspondence of parameters of number

For ease of perception, we will reduce the basic technical requirements in a single table, use it as a cheat sheet when ordering services for applying or self-preparing stencils.

Parameter	Value by GOST	Note
Height of sign	100 mm (minimum)	Increases are allowed proportionally
Width of the figure	60 mm	Strict observance of proportions
Letter width	80 mm	For the letter part of the number
Thickness of the line	10-15 mm	Depends on the size of the font.
Place of application	1/4 length from the nose	On both sides.

This table reflects the basic requirements for most small-sized civil vessels. Exceptions may apply for special purpose vessels or those with non-standard dimensions, but they must be agreed with the GIMS bodies individually. In 99% of cases, these are the rules for private boats and boats.

Frequently Asked Questions (FAQ)

Can I use a stencil purchased in a store if its dimensions are slightly different?

If the difference in size is visible (for example, 8 cm height instead of 10 cm), the inspector has the right to prescribe the stencil, it is better to make the stencil yourself to the exact size or order a professional print in a specialized workshop that guarantees compliance with the standard.

Do I need to register a boat if it has a motor less than 10 hp?

Registration is required for all small vessels weighing more than 200 kg with the engine. If your boat is lighter but you plan to go out, registration plates may still be required to comply with safety regulations, although registration with the GIMS may not be formally required. However, the absence of a number on any motorized boat often attracts the attention of inspectors.

What to do if the number wears off or unstuck during the season?

Reinstate markings as soon as possible, and steering a vessel with an erased or unreadable number is equated with no number, and carry a spare set of stickers or coloring materials to quickly repair the defect and avoid a fine when meeting a GIMS patrol.

In conclusion, it is worth noting that the correct marking of a boat is a sign of a responsible boat owner. With a little time to study the requirements of GOST and quality registration, you will protect yourself from unpleasant surprises on the water and can enjoy your vacation without worrying about inspections. Remember that safety on the water begins with compliance with the rules, and the tail number is one of the key elements of this system.