| 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. |
| Return |
|
