Furuno 525TID-TMD Manuel D’Utilisation

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with Release Bracket

Models: TM258, TM260, TM270W

• Recommended for outboard and inboard/outboard sport fishing 

powerboats, 8m (25') and up

• Not recommended for inboard powerboats
• Not recommended for stepped hulls
• Adjusts to transom angles from 3

°–21°

• Bracket protects the transducer from frontal impact only

Safety goggles
Dust mask
Angle finder
Masking tape (some installations)
Pencil
Electric drill
Drill bits:

Bracket holes

5mm, #4, or 7/32"

Transom hole (optional)

18mm, 11/16", or 3/4"
21mm or 13/16" (

Furuno, Raymarine only)

Cable clamp holes

3mm or 1/8"

Marine sealant (suitable for below waterline)
Socket wrench
Straight edge
Small screwdriver
Grommets (some installations)
Cable ties
Water-based anti-fouling paint (mandatory in salt water)

CAUTION: Do not mount the transducer in an area of turbulence 
or bubbles: near water intake or discharge openings; behind 
strakes, struts, fittings, or hull irregularities.

CAUTION: Avoid mounting the transducer where the boat may be 
supported during trailering, launching, hauling, or storage.

• For best performance, the transducer must be in contact with aera-

tion-free and turbulence-free water. To identify an area of smooth 
water, observe the flow off the transom while the boat is underway.

• Allow headroom space above the bracket for it to release and 

rotate the transducer upward.

• Mounting on the side of the transom where the propeller blades 

are moving downward is preferred (see Figure 1). 

• Mount the transducer as close to the centerline (keel) of the 

boat as possible to ensure the transducer’s face remains in the 
water when the boat is turning. However, keep in mind that it 
should be a minimum of 15 cm (6") beyond the swing radius of 
the propeller, so the water passing over the transducer does not 
cause a flow disturbance to the propeller.

Record the information found on the cable tag for future reference.

Part No.________________ Date___________ Frequency________ kHz

WARNING: Always wear safety goggles and a dust 

mask when installing to avoid personal injury.

CAUTION: Never pull, carry, or hold the transducer by 

the cable as this may sever internal connections.

CAUTION: Do not strike the transducer to release it. 

When mounted on the bracket, remove the transducer 

by removing the locking pin and hinge pin.

CAUTION: Never use solvents. Cleaners, fuel, 

sealants, paint, and other products may contain strong 

solvents, such as acetone, which attack many 

plastics, greatly reducing their strength.

IMPORTANT: Please read the instructions completely 

before proceeding with the installation. These 

instructions supersede any other instructions in your 

instrument manual if they differ.

TM260 
with shims
in operational position

Figure 1. Mounting location on single drive boat

15cm (6")
minimum beyond
swing radius

NOTE: Starboard 

side of hull where 

propeller blades are 

moving downward 

is prefered.

Copyright © 2009 Airmar Technology Corp.

hull projection
0–3mm (0–1/8")

parallel to 
waterline