Upolu Point was probably valid. Potato Point is hard to say. While the time is good, but it shares the frequency with Upper Keneenaw, which is in here pretty strong. Potato point is very possible, but...
More gaps in the graphs. The symptoms appear to be related to be computer related here, but due to the times, no idea why.
Potato Point
Thursday, January 11, 2018 23:46:23Cape Race
Friday, January 12, 2018 01:59:02Upolu Point
Friday, January 12, 2018 09:39:51
Friday, January 12, 2018 10:05:04Count ID ref1 ref2 kHz Baud City Country Lat Lon km Deg
1 648 696 697 320.5 200 E Saki Japan 34.603 135.003 9,909 322
1 001 001 001 286.0 200 Semikarakorsk? Russia 47.543 40.876 8,801 29
2 879 258 259 286.0 100 Upolu Point, Hi Hawaii 20.257 -155.885 6,285 266
621 897 294 295 313.0 100 Kodiak, AK Alaska 57.621 -152.201 4,167 311
1 895 290 291 298.0 100 Potato Point, AK Alaska 61.061 -146.706 3,843 317
46 892 284 285 288.0 100 Gustavus, AK Alaska 58.427 -135.706 3,200 313
1 940 338 339 315.0 200 Cape Race, NL Canada 46.661 -53.075 3,098 72
3929 891 282 283 295.0 100 Level Island, AK Alaska 56.467 -133.098 3,014 309
66 889 278 279 323.0 100 Annette Island, AK Alaska 55.069 -131.6 2,901 306
268 944 342 343 310.0 200 Cape Norman, NL Canada 51.509 -55.831 2,842 62
598 942 340 341 288.0 200 Cape Ray, NL Canada 47.636 -59.241 2,621 71
5 885 270 271 292.0 100 Cape Mendocino, CA United States 40.447 -124.405 2,563 270
724 909 300 301 309.0 200 Alert Bay, BC Canada 50.589 -126.93 2,554 296
335 808 016 017 314.0 200 Card Sound, FL United States 25.442 -80.452 2,468 147
450 881 262 263 302.0 100 Point Loma, CA United States 32.677 -117.25 2,462 244
352 908 302 303 315.0 200 Tofino [Amphitrite Point], BC Canada 48.931 -125.545 2,456 292
20375 764 210 211 314.0 200 Lincoln, CA United States 38.855 -121.361 2,395 263
5857 886 272 273 287.0 100 Fort Stevens, OR United States 46.208 -123.96 2,363 284
18146 907 304 305 320.0 200 Richmond, BC Canada 49.114 -123.183 2,283 292
2 935 334 335 312.0 200 Western Head, NS Canada 43.993 -64.67 2,273 83
500 888 276 277 302.0 100 Whidbey Island, WA United States 48.322 -122.706 2,249 290
849 887 274 275 323.0 200 Robinson Point, WA United States 47.392 -122.38 2,230 287
16 936 332 333 319.0 200 Point Escuminac, NB Canada 47.075 -64.8 2,210 74
4365 871 172 173 300.0 100 Appleton, WA United States 45.792 -121.332 2,168 282
672 809 018 019 289.0 100 Cape Canaveral, FL United States 28.467 -80.554 2,162 144
1 939 326 327 295.0 200 Partridge Island, NB Canada 45.239 -66.056 2,138 80
24021 827 244 245 312.0 200 Tampa, FL United States 27.85 -82.543 2,138 149
1 925 320 321 313.0 200 Moise, QC Canada 50.202 -66.119 2,115 64
5612 799 044 045 290.0 200 Penobscot, ME United States 44.453 -68.776 1,942 83
17944 772 198 199 306.0 200 Acushnet, MA United States 41.749 -70.889 1,852 93
22344 771 196 197 294.0 100 New Bern, NC United States 35.181 -77.059 1,765 123
1006 778 192 193 292.0 100 Kensington, SC United States 33.491 -79.349 1,759 132
765 828 246 247 301.0 100 Angleton, TX United States 29.301 -95.484 1,756 187
1472 803 006 007 293.0 100 Moriches, NY United States 40.794 -72.756 1,743 98
12387 927 316 317 309.0 200 Lauzon, QC Canada 46.821 -71.165 1,729 75
319 814 028 029 293.0 200 English Turn, LA United States 29.886 -89.947 1,709 169
19355 806 012 013 289.0 100 Driver, VA United States 36.963 -76.562 1,670 116
3998 804 008 009 286.0 200 Sandy Hook, NJ United States 40.475 -74.02 1,659 101
44897 844 094 095 324.0 200 Hudson Falls, NY United States 43.272 -73.542 1,595 90
31 929 312 313 296.0 200 St Jean Richelieu, QC Canada 45.324 -73.317 1,574 82
28336 847 058 059 301.0 200 Annapolis, MD United States 39.018 -76.61 1,538 110
1 865 160 161 320.0 200 Millers Ferry, AL United States 32.095 -87.397 1,528 158
1115 919 308 309 306.0 200 Cardinal, ON Canada 44.783 -75.417 1,417 85
47752 792 136 137 297.0 200 Bobo, MS United States 34.125 -90.696 1,233 168
31149 839 118 119 322.0 100 Youngstown, NY United States 43.239 -78.972 1,170 95
8116 918 310 311 286.0 200 Wiarton, ON Canada 44.75 -81.117 971 87
51878 838 116 117 319.0 200 Detroit, MI United States 42.306 -83.103 883 106
31367 836 112 113 292.0 200 Cheboygan, MI United States 45.656 -84.475 704 81
89885 777 218 219 304.0 200 Mequon, WI United States 43.202 -88.066 474 113
45934 831 102 103 298.0 100 Upper Keweenaw, MI United States 47.233 -88.628 446 55
44950 830 100 101 296.0 100 Wisconsin, Point WI United States 46.708 -92.025 219 30
CURRENT DGPS ADVISORIES FOR 12 Jan 2018
Site Name Site Id BNM # OUTAGE MESSAGE
SCHEDULED / UNSCHEDULED OUTAGES
Lincoln 764 0491-17
BROADCAST SITE WILL BE UNUSABLE FROM 01/16/2018 17:00 Z TO 01/16/2018 19:00 Z.
Card Sound 808 0010-18
BROADCAST SITE WILL BE UNUSABLE FROM 01/31/2018 12:00 Z TO 02/01/2018 04:00 Z.
Upolu Point 879 0012-18
BROADCAST SITE WILL BE UNUSABLE FROM 02/07/2018 18:00 Z TO 02/10/2018 08:00 Z.
New Bern 771 0013-18
BROADCAST SITE WILL BE UNUSABLE FROM 02/05/2018 13:00 Z TO 02/07/2018 23:00 Z.
Kensington 778 0090-18
BROADCAST SITE WILL BE UNUSABLE FROM 01/23/2018 12:00 Z TO 01/24/2018 04:00 Z.
Gustavus 892 0015-18
BROADCAST SITE STATUS IS UNCONFIRMED DUE TO NETWORK OUTAGE AS OF 01/12/2018 18:35 Z UNTIL FURTHER NOTICE.
Point Loma 881 0410-17
BROADCAST SITE STATUS IS UNCONFIRMED DUE TO NETWORK OUTAGE AS OF 10/19/2017 09:17 Z UNTIL FURTHER NOTICE.
Cape Mendocino 885 0502-17
BROADCAST SITE WILL BE UNUSABLE FROM 01/23/2018 16:00 Z TO 01/24/2018 02:00 Z.
CANADIAN DGPS OUTAGES
CURRENT CANADIAN DGPS ADVISORIES FOR 12 Jan 2018
Site Name Site Id BNM # OUTAGE MESSAGE
SCHEDULED / UNSCHEDULED OUTAGES
Hartlen Point N001-18
BROADCAST SITE IS UNUSABLE AS OF 01/08/2018 20:20 Z UNTIL FURTHER NOTICE.AFE822x v2.0 SDR with 43' Wellbrook ALA100LN loop oriented E-W