1.1 Devices to measure and indicate speed and
distance are intended for general navigational and ship manoeuvring
use. The minimum requirement is to provide information on the distance
run and the forward speed of the ship through the water or over the
ground. Additional information on ship's motions other than in the
forward axis may be provided. The equipment should comply fully with
its performance standard at forward speeds up to the maximum speed
of the ship. Devices measuring speed and distance through the water
should meet the performance standard in water of depth greater than
3 m beneath the keel. Devices measuring speed and distance over the
ground should meet the performance standard in water of depth greater
than 2 m beneath the keel.
1.2 Radar plotting aids/track control equipment
require a device capable of providing speed through the water in the
fore and aft direction.
1.3 In addition to the general requirements in resolution A.694(17), devices to measure
and indicate speed and distance should comply with the following minimum
performance requirements.