Humminbird Marine GPS System 4087301 User Manual

4.1

Out of 8 Ratings

Owner's of the Humminbird Marine GPS System 4087301 gave it a score of 4.1 out of 5. Here's how the scores stacked up:

  • Reliability

    4.14 out of 5

  • Durability

    4.29 out of 5

  • Maintenance

    4.0 out of 5

  • Performance

    4.0 out of 5

  • Ease of Use

    4.14 out of 5
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NOTE: It is often necessary to make several incremental transducer adjustments before
optimum high speed performance is achieved. Due to the wide variety of boat hulls,
however, it is not always possible to obtain high speed depth readings.
6. Once you have reached a consistently good sonar signal at the desired
speeds, you are ready to lock down the transducer settings. Remove
the transducer from the bracket (after noting where the ratchets are
assembled), then re-align the mounting bracket against the transom of
the boat to match the traced silhouette. Check the bracket position
with the level again to make sure it is still level, then mark the third
mounting hole using a pencil or marker. Unscrew and remove the
mounting screws and the transducer bracket and set aside.
7. Drill the third mounting hole, using a 5/32” drill bit. Use a marine-
grade silicone sealant to fill all three drilled mounting holes, especially
if the holes penetrated the transom wall.
NOTE: On fiberglass hulls, it is best to use progressively larger drill bits to reduce the
chance of chipping or flaking the outer coating.
8. Re-position the transducer bracket against
the transom of the boat, then hand-install all
three screws. Make sure that the transducer
location has not changed, then fully tighten
all three mounting screws (Figure 27).
Hand
tighten only!
Re-install the transducer to the
mounting bracket, making sure to assemble
the ratchets in the same location they had
before. (See Figures 18a - 18d and Figure 21 -
22). If you have performed the preceding
procedures correctly, the transducer should
be level and at the right height for optimal
operation.
Figure27
Fully Tighten AllThree
Mounting Screws
19
Transom Transducer Installation

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