Sail Safely: Use a Reliable Paper Chart

NOAA Nautical Chart 18537

Columbia River Alderdale to Blalock Islands

Scale: 20,000
Actual Chart Size: 34.2" x 27.5"
Paper Size: 36.0" x 31.0"
Edition #: 12
Edition Date: 2015-12-01
NTM Notice/Date: 4120 2020-10-10
LNM Notice/Date: 4020 2020-10-06

NTM = NGA Notice to Mariners
LNM = Local Notice to Mariners

The chart you are viewing is a NOAA chart by OceanGrafix. Printed “on-demand,” it contains all of the latest NOAA updates as of the time of printing. This chart is available for purchase online.

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