Grand S370N User manual

CONTENTS

CONTENTS
Edition 3/April 2023

TABLE OF CONTENTS
5 Silver Line S370N, S420N Owner’s Manual
1. SAFETY INFORMATION ..................................................................................... 11
Introduction .....................................................................................................................11
Precautionary symbols.......................................................................................................12
General information...........................................................................................................14
Maximum number of persons .............................................................................................15
Maximum loading capacity .................................................................................................15
Engine information............................................................................................................16
Risk of flooding and stability ..............................................................................................17
Bilge pump (optional) and bailing .......................................................................................20
Stability and buoyancy.......................................................................................................21
Risk of fire or explosion .....................................................................................................23
Fire prevention .................................................................................................................24
Fuel .................................................................................................................................27
While fueling ....................................................................................................................27
Fire-fighting equipment (for S420N) ...................................................................................28
Electrical systems - Safety rules .........................................................................................29

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Engine starting ........................................................................................................ 29
Man-overboard prevention and recovery .................................................................... 29
Means of reboarding ................................................................................................ 30
Danger from moving parts ........................................................................................ 30
Safety equipment..................................................................................................... 31
Safety driving rules .................................................................................................. 32
2. BOAT IDENTIFICATION............................................................................. 34
Boat’s identification number...................................................................................... 34
Builder’s plate.......................................................................................................... 35
3. BEFORE OPERATING YOUR CRAFT ............................................................ 37
Weather.................................................................................................................. 37
Checklist before departure ........................................................................................ 37
General ................................................................................................................... 38
Checking the boat and equipment ............................................................................. 39
Rules to observe when afloat .................................................................................... 40

TABLE OF CONTENTS
7 Silver Line S370N, S420N Owner’s Manual
4. OPERATING THE CRAFT............................................................................. 41
Windscreen installation............................................................................................. 41
CL-11 steering console installation............................................................................. 42
CS-01W/CS-03 steering console installation................................................................ 43
Container installation................................................................................................ 44
Tube inflation .......................................................................................................... 45
Overpressure valve (if fitted)..................................................................................... 52
Motor installation ..................................................................................................... 53
Electrics .................................................................................................................. 56
Navigation lights ...................................................................................................... 62
Horn ....................................................................................................................... 62
Anchoring and mooring ............................................................................................ 64
Anchoring................................................................................................................ 64
Mooring .................................................................................................................. 65
Beaching, launching and recovering the boat from the water ....................................... 67
Towing.................................................................................................................... 68

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5. TECHNICAL INFORMATION ....................................................................... 77
Technical specifications ............................................................................................ 77
Standard and optional equipment .............................................................................. 79
Compartment chart .................................................................................................. 81
General arrangement of a boat S370N (NF), S420N (NF)............................................. 82
General arrangement of a boat S370NS (NSF), S420NS (NSF)...................................... 83
General arrangement of a boat S370NL (NLF), S420NL (NLF) ...................................... 84
Steering console components.................................................................................... 85
General view of a boat S370N ................................................................................... 86
General view of a boat S370NF ................................................................................. 87
General view of a boat S370NS ................................................................................. 88
General view of a boat S370NSF................................................................................ 89
General view of a boat S370NL ................................................................................. 90
General view of a boat S370NLF................................................................................ 91
Loading passengers for S370NS (S370NSF)................................................................ 93
Loading passengers for S370NL (S370NLF) ................................................................ 94

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9 Silver Line S370N, S420N Owner’s Manual
General view of a boat S420N ................................................................................... 95
General view of a boat S420NS ................................................................................. 96
General view of a boat S420NL ................................................................................. 97
Loading passengers for S420N (S420NF).................................................................... 98
Loading passengers for S420NS (S420NSF)................................................................ 99
Electrical schematic diagram ................................................................................... 101
6. SERVICE AND MAINTENANCE ................................................................. 103
Cleaning................................................................................................................ 104
Cleaning of tube .................................................................................................... 105
Plastic preservation ................................................................................................ 107
Cleaning................................................................................................................ 107
Salt removal .......................................................................................................... 108
Polishing ............................................................................................................... 108
Waxing ................................................................................................................. 108
Cleaning of the underwater part of the hull from deposits.......................................... 109
Antifouling hull protection ....................................................................................... 109

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Upholstery care...................................................................................................... 110
Acrylic glass windshield care ................................................................................... 111
Airtightness of the inflatable tube ............................................................................ 112
Maintenance of stainless steel ................................................................................. 114
Winterizing and storage.......................................................................................... 114
Regular inspections ................................................................................................ 115
7. TRAILERING ............................................................................................ 116
Lifting the boat ...................................................................................................... 116
Boat towing........................................................................................................... 117
8. RESPECTING THE ENVIRONMENT ........................................................... 118
9. GRAND’S WARRANTY .............................................................................. 119
General ................................................................................................................. 119
Warranty period..................................................................................................... 119
Warranty coverage................................................................................................. 120
Warranty exclusions ............................................................................................... 121
FOR YOUR NOTES.................................................................................................. 123

SAFETY
11 Silver Line S370N, S420N Owner’s Manual
1. SAFETY INFORMATION
INTRODUCTION
Thank you for choosing a Grand boat.
If you need assistance or advice please contact your Grand Dealer or Distributor who has qualified
specialists, special tools, original spare parts and accessories and will be happy to assist.
This Manual provides an overview for the safe operation of your Grand boat and is not intended to
teach you how to repair it . Please take time to read it carefully so as to become familiar with your
new boat. Make sure that you fully understand the controls and instructions before operating the
boat. Improper operation can be extremely dangerous!
Please, note that most boating-related accidents happen when safety instructions are ignored. We
want you to enjoy your experience on your boat so please be sure to take our guidance seriously
and comply with safety instructions at all times.
The basic safety rules are stated throughout the Manual, additional precautions are indicated by the
special PRECAUTIONARY SYMBOLS:

SAFETY
12
PRECAUTIONARY SYMBOLS
The following precautionary symbols are used throughout this Manual:
Indicates an imminently hazardous situation that, if not avoided,
will result in death or serious injury. This signal word is to be
limited to the most extreme situations.
Indicates a potentially hazardous situation that, if not avoided,
could result in death or serious injury.
Indicates a potentially hazardous situation that, if not avoided,
could result in minor or moderate injury.
Please note that in some countries a boat operating license or other form of authorization may be
required.
We strongly recommend that your boat is inspected at least once a year by an
authorized Grand agent.

SAFETY
13 Silver Line S370N, S420N Owner’s Manual
Helmsmen should be familiar with the use of all safety equipment and emergency procedures
(e.g. man overboard recovery, towing etc.). We strongly recommend that appropriate training is
undertaken from a recognized boating and/or safety organization prior using your boat.
Please note that in some countries it is a mandatory requirement to wear a buoyancy aid.
Some information may not apply to your boat since standard and optional equipment may vary
from model to model.
Data sheets and specifications given in this manual relate to the boat's characteristics at the time
of publishing. Grand reserve the right to introduce changes in specifications and equipment
without notice and without obligation.
We continually work with our customers to improve quality and to ensure you will be completely
satisfied with your Grand boat.
If you have any additional questions after reading this manual, please feel free to ask for your
dealer.
PLEASE KEEP THIS MANUAL IN A SECURE PLACE, AND HAND IT OVER TO THE NEW
OWNER WHEN YOU SELL THE CRAFT.

SAFETY
14
GENERAL INFORMATION
Name of craft Manufacture: GRAND MARINE. Models: S370N, S370NF, S370NS, S370NSF, S370NL,
S370NLF, S420N, S420NF, S420NS, S420NSF, S420NL, S420NLF.
According to the Recreational Craft Directive 2013/53/EU of the European Parliament and of the
Council of 20th November 2013, which is in force, your boat has design category: C, i.e., the craft is
designed to operate in the following conditions:
Wind (Beaufort scale) up to and including Force 6.
Significant wave height (H1/3, meters) up to and including 2 meters.
Explanatory note:
A watercraft given design category C is considered to be designed for a wind speed up to and
including Force 6 and significant wave height up to and including 2 m.
BE RESPONSIBLE, TAKE NOTICE OF THESE PARAMETERS WHEN YOU PLAN YOUR NAVIGATION
PROGRAM AND DO NOT BOAT IF THE WIND/WAVE CONDITIONS ARE LIKELY TO EXCEED THESE
PARAMETERS.

SAFETY
15 Silver Line S370N, S420N Owner’s Manual
MAXIMUM NUMBER OF PERSONS
The Maximum number of people (adults + children) authorized to be on board according to design
standards ISO 6185, ISO 14946 and ISO 12217 is given in the technical data sheet in the
“TECHNICAL INFORMATION” section.
DO NOT EXCEED THE MAXIMUM RECOMMENDED NUMBER OF PEOPLE. REGARDLESS OF THE
NUMBER OF PEOPLE ON BOARD, THE TOTAL WEIGHT OF PEOPLE AND EQUIPMENT MUST NEVER
EXCEED THE MAXIMUM RECOMMENDED LOAD. ALWAYS USE THE SEATS/SEATING SPACES
PROVIDED.
MAXIMUM LOADING CAPACITY
You can find the maximum load capacity in the “TECHNICAL INFORMATION” section in this Manual.
It is also shown on the manufacturer’s plate affixed to the hull. Please note that the maximum load
capacity includes the weight of all people onboard, outboard engine, provisions, personal effects,
and additional equipment minus liquids in fixed tanks. Note that excess and unevenly distributed
load within the boat can create unstable steering conditions and even loss of control.

SAFETY
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WHEN LOADING THE CRAFT, NEVER EXCEED THE MAXIMUM RECOMMENDED LOAD. ALWAYS LOAD
THE CRAFT CAREFULLY AND DISTRIBUTE LOADS APPROPRIATELY TO MAINTAIN DESIGN TRIM
(APPROXIMATELY LEVEL). AVOID PLACING HEAVY WEIGHTS HIGH UP.
ENGINE INFORMATION
Information about recommended engine capacities, maximum engine capacities, maximum engine
weights for each model are given in the technical data sheet of “TECHNICAL INFORMATION” section.
Please refer to the manual supplied by motor manufacturer before operating the motor
and craft.
Routine maintenance should be carried out in strict conformity with the instructions given
in the appropriate motor owner's manual.
NEVER USE A MOTOR WITH A POWER OUTPUT GREATER THAN THE MAXIMUM RECOMMENDED,
OR HEAVIER THEN INDICATED ON THE MANUFACTURER'S PLATE. THIS COULD RESULT IN LOSS
OF CONTROL.

SAFETY
17 Silver Line S370N, S420N Owner’s Manual
RISK OF FLOODING AND STABILITY
HULL DRAINAGE
NEVER OPEN THE HULL DRAIN PLUG WHEN AFLOAT.
To drain the hull, remove the plug (fig. 1).
Fig. 1. The hull drain plug is located on the transom.
After removal refit and re-tighten (do not over-tighten) the plug before using the boat.
Hull drain plug

SAFETY
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COCKPIT DRAINAGE OF S370N
The boat is equipped with one cockpit drain valve located at the transom.
Fig. 2. Cockpit drain valve.
WHEN THE BOAT IS ON LAND/DAVIT OR TRAILER, OPEN THE COCKPIT DRAIN VALVE SO THAT
WATER (RAINWATER, FOR INSTANCE) CAN EASILY DRAIN OUT OF THE BOAT AND NO DAMAGE
TO THE INTERNAL COMPONENTS (E.G THE BATTERY) WILL OCCUR.
Cockpit
drain valve

SAFETY
19 Silver Line S370N, S420N Owner’s Manual
COCKPIT DRAINAGE OF S420N
The boat is equipped with two cockpit drain plugs located at the transom.
Fig. 3. Cockpit drain plugs.
WHEN THE BOAT IS ON LAND/DAVIT OR TRAILER, OPEN THE COCKPIT DRAIN PLUGS SO THAT
WATER (RAINWATER, FOR INSTANCE) CAN EASILY DRAIN OUT OF THE BOAT AND NO DAMAGE
TO THE INTERNAL COMPONENTS (E.G THE BATTERY) WILL OCCUR.
Main cockpit
drain plug
Additional cockpit
drain plug

SAFETY
20
BILGE PUMP (OPTIONAL) AND BAILING
The craft can be equipped with a bilge pump and drain pipe. In this case use a switch located on
the steering console to turn it on/off.
THE BILGE PUMP SYSTEM IS NOT DESIGNED FOR DAMAGE CONTROL.
CHECK BILGE PUMPS REGULARLY TO MAKE SURE THEY ARE WORKING. CLEAR DEBRIS FROM
PUMP INLETS.