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This website is devoted to the science of vexillology (the study of flags).
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Last modified: 2019-05-28 by 
zoltán horváth
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![[Hydrographic Ship Pennant - ROC]](../images/t/tw~hyd62.gif)
image by
Akira Oyo and Miles Li, 13 April 2014
since 1962
Blue triangular pennant with white disk with 10 wavy lines throughout and
overall a blue anchor.
The disk size is 1/2 the hoist, the anchor height is 1/3 the hoist. The vertical
axis of the disk (and anchor) distance from the hoist is indicated as 28/75 of
hoist size.
This pennant was presumably used as signal on hydrographic ships in addition to
their regular ensign (weather that was the naval or merchant ensign or, I guess
not that often, one of the special ensigns).
Source: Flaggenbuch, 1939
Željko Heimer, 9 February 2003
The flag was revised in 1962 to add the National Emblem above the
anchor
Please see:
https://zh.wikipedia.org/wiki/File:ROCN_Navigating_Battle_Ship_Pennant.svg.
Akira Oyo, 09 March 2014
Flag
![[Pre-1928 flag]](../images/t/tw~hyd.gif)
image by Miles Li, 9 December 2016
Pennant
![[Pre-1928 flag]](../images/t/tw~hyd22.gif)
image by Miles Li, 9 December 2016
![[Hydrographic Ship Pennant - ROC]](../images/c/cn~hyd29.gif)
image by
Akira Oyo and Miles Li, 13 April 2014
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