ANNEX
AMENDMENTS TO RESOLUTION A.824(19) ON PERFORMANCE STANDARDS FOR DEVICES TO INDICATE SPEED AND DISTANCE
Replace the Annex by:
"ANNEX
RECOMMENDATION ON PERFORMANCE STANDARDS FOR DEVICES TO MEASURE AND INDICATE SPEED AND DISTANCE
1 INTRODUCTION
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.
2 METHODS OF PRESENTATION
2.1 Speed information may be presented in either analogue or digital form. Where a digital display is used, its incremental steps should not exceed 0.1 knots. Analogue displays should be graduated at least every 0.5 knots and be marked with figures at least every 5 knots. If the display can present the speed of the ship in other than the forward direction, the direction of movement should be indicated unambiguously.
2.2 Distance run information should be presented in digital form. The display should cover the range from 0 to not less than 9999.9 nautical miles and the incremental steps should not exceed 0.1 nautical miles. Where practicable, means should be provided for resetting a readout to zero.
2.3 The display should be easily readable by day and by night.
