NorthStar 490 Echosounder Install Manual page 15

Northstar 490 echosounder car-echo sounder: install guide
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Model
AirMar B44V/B744V with fairing
AirMar B44V/B744V without fairing
AirMar B250 with fairing
AirMar B250 without fairing
490 INSTALLATION MANUAL, Revision B2
Table 2: Hull thickness limits
(Load Waterline Length)
outboard and I/O
step-hull
Figure 1: Recommended installation locations for a transducer
SECTION TWO Installing the transducer
Minimum
6 mm (1/4 inch)
6 mm (1/4 inch)
——
19 mm (3/4 inch)
1/3 aft
LWL
displacement hull
planning hulls
fin keel sailboat
full keel sailboat
Best location for the transducer
Maximum
19 mm (3/4 inch)
65 mm (2 1/2 inches)
45 mm (1 3/4 inches)
114 mm (4 1/2 inches)
pressure waves
150-300mm
(6-12")
inboard
Page 9

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