JP 3-50 National Search and Rescue Manual Vol I - US Navy

Figure 5-9. Drift Error by Minimax
TABLE 5-2. Navigational Fix Errors
Means of Navigation Fix Errors (NM)
NAVSAT 0.5 NM
Radar 1 NM
Visual Fix (3 lines)* 1 NM
Celestial Fix (3 lines)* 2 NM
Marine Radio Beacon 4 NM (3 beacon fix)
LORAN C 1 NM
OMEGA 4 NM
INS 0.5 NM per flight hour without
position update
VOR ± 3 degrees arc and 3 percent of
distance or 0.5 NM radius,
whichever is greater
TACAN ± 3 degrees arc and 3 percent of
distance or 0.5 NM radius,
whichever is greater
*Should be evaluated upward according to circumstances.
C. Initial Position Error (X) is the assumed error of the initial
position based on navigational accuracy of the distressed craft or the
position fixing accuracy of the radio DF net, radar net, SOFAR net,
etc., reporting the initial position.
1. If information on the means of navigation used by the
distressed craft is available, the navigational
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