Introduction to sailings Flashcards
What does the term Loran mean
LOng RAnge Navigation
When did LORAN sop transmitting
2010
At what frequency does the LORAN signal operate in
100kHz pulses
What are the three components make up LORAN
Transmitting Stations
Chains
secondary chains
What are the three ways you can use LORAN to find a position
Chart with LORAN time delay lattice
Computer algorithms
What components for LORAN does a navigator need
Receiver
Antenna
Loran Charts
What is the three processing stages for a LORAN receiver
search and acquisition
Settle phase
Tracking and lock
How do you ensure that ground and skywave signals are not contaminated
Phase coding
What direction do LORAN signals travel
All directions
What is required for rho-rho navigation
a very accurate clock
What is RHO-Theta navigation
range direction navigation
what frequencies are typically line of site
VHF
UHF
What frequency range is most effective at long range
HF
How many layers are in the ionisphere
3
D E and F
How can transmission of HF radios waves be accomplished
reflection and refraction
What is p or departure
The distance in NM between two meridians at any given parallel of latitude
Or read as
linear measure in NM of an arc of a parallel included between two meridians
What is a rhumb line
makes the same angle with all meridians it crosses and appears on a mercator chart as a straight line
What are the types of Rhumb sailings
Mercator
Parallel
Plane
Mid lat
Traverse
Meridian
What is composite sailing
used with a great circle with rhumb lines inserted as required to sail along certain latitudes or limit latitude creep
What is another tool you can use to solve right triangles
Traverse table
What are sailings
They are mathematical procedures involving computations between latitude and longitude of the departure point course and speed and destination LAT LONG
What is the most accurate sailing
Great circle
What other sailing provide less precise results but are still useful are
Midlat and mercator
