Raydist strip chart record used to keep track of individual navigation rates.These strip charts required continuous monitoring by a watch-stander.Used to assure navigational accuracy during hydrographic surveying operations.First tests of Raydist on
3/20/2019 10:37:43 AM
Date: 20-Aug-54
Credit: C&GS; Season's Report Bolstad 1954
Location: Tampa Bay area
Subject: Charting
Subject: Navigation
Subject: Electronic
Subject: HF and MF Systems