03

Introduction

“There are no charis of any parł of ihe world so accurate and no direciions so perfect as not to fumish frcąuenl occasion for rcvision and amendrnent”.

Title page of the 'Nautical Mcigazine \ pubUshcd in J832.

“The degree of reliance to be placed on a chart musi dcpend upon the characlcr and compleleness of ihe original survey malerial and on the compleleness of reports of subsccjuent changes. The chart musi never be laken for granted”.

Adn i i rai ty' M ai i ual of A^la vigati on, / 98 7.

Thcsc quotalions are saying the same thing. These important statements are rerainders that you can rely on Admiralty chaits ONLY if they are correcled up lo dale.

This document docs not attcmpl lo leach navigalion. It is assumed that you are able to plot from the lexl of an Admiralty Notice lo Mariners and that you know how lo position a correction accurately on the chait.

The purpose of this document is lo set out simply and clearly the essential poinis of good chan correcling practices.

For the purpose of demonstrating chart updating techniąues, the examples shown are from charis which wcrc corrected by hand in the Chait Correcling Office at the UK Hydrographic Office. The correction is madę in violct ink.

3