Use & limitations of GPS/Chart plotters

Make candidates aware of the pros and cons and differences between GPS and Chart Plotters. 

Pre-set Variation & Deviation

True or Magnetic bearings?

Datum offset i.e. OS36 or WGS84?

No accounting for hazards, unlike satnav, a GPS/Chart plotter does not know where hazards are located. 

Using a fixed object (buoy) as a waypoint - you may well hit it!

Human error - inputting the wrong position

Technology error - satellite geometry, aerial damage or positioning

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