Simrad NAIS-400 - Installing the external GPS antenna

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Installation | NAIS-400 User Manual
Fig. 5 Dimensions
52 mm
152 mm
135 mm
98 mm
47 mm
Figure 5 AIS transceiver dimensions
Fig. 6 Mounting
Figure 6 AIS transceiver mounting
Step 2 - Installing the external GPS antenna
It is not recommended that the GPS antenna is mounted up a mast
where the motion of the vessel will cause the antenna to swing and
potentially reduce the accuracy of the GPS position. Also, do not
mount the antenna in the direct path of a radar transmitter.
To pole mount the external GPS antenna, you will require a 1-inch
14 TPI thread pole.