Field Day and Winter Field Day

ARRL Field Day (June) and Winter Field Day (January) are the two contest event types. They differ only in class letters and the Cabrillo contest name; the rest of this page applies to both.

Setting up

Class is a transmitter count plus a letter:

So 3A is three transmitters, club portable. The entry form validates the letter against the event type — a 3H on a Field Day event is flagged.

ARRL section is your own section, sent as part of the exchange.

Power category sets the score multiplier and is one of HIGH, LOW (≤150 W) or QRP (≤5 W).

The exchange

Both contests use class + section. You send yours (taken from the event, so operators never retype it) and log theirs.

The received section is validated against the app's section list and flagged if unrecognised — again a warning, not a refusal, since the list can lag changes to the official one.

Scoring

score = QSO points × power multiplier + bonus points

Sections do not multiply the score, and they are not a bonus either. Rule 7.3 lists eighteen bonuses and none of them concerns sections. Working every section is an operating goal the app helps you chase; it is worth no points. Treating sections as a multiplier is the single most commonly mis-implemented part of the Field Day formula, and getting it wrong inflates a score enormously — a 60-section event would come out sixty times too high.

Duplicates score nothing and are excluded from exports.

Bonus points

Tracked from the dashboard's Bonus panel. Changes save immediately and appear on every connected screen.

Values are transcribed from the official ARRL rules (Revised 4/2026), and each row carries its rule number so you can check it against the source. Not every bonus is available to every class — 7.3.1 excludes Class D, 7.3.17 is Class A only, and so on. The app does not enforce class eligibility, so read the rule before ticking a box.

Emergency power is per transmitter, not a doubling. A 3A entry claims 300 points, not "the whole score again" — the app read this wrong until the 2026 rules were checked line by line, which inflated claimed scores by thousands of points. The panel shows the arithmetic (+100 × 3 tx) so the number is visible rather than implied.

Bonuses are added after the power multiplier is applied, so a QRP entry's bonuses are worth exactly the same as a high-power entry's. Rule 7.3.13.1 says so explicitly for GOTA contacts, and it holds for all of them.

Winter Field Day

Winter Field Day is run by the Winter Field Day Association, not the ARRL, and scores by a different model — it has no bonus points and no power multiplier at all:

score = total QSO points × (Objective Multiplier + 1)

Objectives are ticked in the same dashboard panel, which switches to an Objectives list showing the OM each one contributes. See the rules reference for the full table.

Submitting

From the logger header or the dashboard:

Cabrillo (CLUBCALL_FD2026.log) is the ARRL submission format. Upload it to the Field Day online entry form.

ADIF (CLUBCALL_FD2026.adi) is for LoTW, QRZ Logbook, or any log manager. Contest QSOs carry MY_ARRL_SECT, STX_STRING (your class and section) and SRX_STRING (theirs).

Summary sheet is a printable worksheet mirroring the ARRL entry form: QSO totals by mode, the score calculation with the power multiplier shown as its own line, active bonuses itemised, sections worked, and the operator list.

Both exports include only non-duplicate QSOs, in chronological order.

Sections

The app ships a list of ARRL and RAC sections used for validation, the map and the section grid. It contains 85 entries — the 71 US sections plus the 14 current RAC sections, including Puerto Rico, the Virgin Islands and the Ontario splits (ONE, ONN, ONS, GH). If you work a section the app doesn't recognise you will get a warning and the QSO will log normally — the exchange is stored as typed, and the dashboard lists the unrecognised values so a typo can be spotted and corrected.

DX is accepted as an exchange without a warning — Field Day stations outside the US and Canada send it — but it is not a section, so it doesn't count toward your sections-worked total.