Landmarks: |
Only work in
local area. Subject to movement or destruction by environmental factors. |
Dead Reckoning: |
Very complicated.
Accuracy depends on measurement tools which are usually relatively crude. Errors
accumulate quickly. |
Celestial: |
Complicated. Only
works at night in good weather. Limited precision. |
OMEGA: |
Based on
relatively few radio direction beacons. Accuracy limited and subject to radio
interference. |
LORAN: |
Limited coverage
(mostly coastal). Accuracy variable, affected by geographic situation. Easy to jam or
disturb. |
SatNav: |
Based on
low-frequency doppler measurements so it's sensitive to small movements at receiver. Few
satellites so updates are infrequent. |
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